Calculate the pH at the equivalence point for the following titration: 0.20 M HCl versus 0.10 M NaOH.

Answers

Answer 1

The pH at the equivalence point for the titration of 0.20 M HCl versus 0.10 M NaOH is 7.0.

The reaction between HCl and NaOH is a strong acid-strong base titration. At the equivalence point, all of the HCl has reacted with an equal amount of NaOH to form water and NaCl.

Steps

The balanced equation for the reaction is:

HCl + NaOH → NaCl + H2O

Since the reaction between HCl and NaOH is a 1:1 stoichiometric ratio, we can say that at the equivalence point, the moles of HCl consumed are equal to the moles of NaOH added.

Moles of HCl = concentration of HCl × volume of HCl used

Moles of NaOH = concentration of NaOH × volume of NaOH added

At the equivalence point, Moles of HCl = Moles of NaOH. Therefore,

concentration of HCl × volume of HCl used = concentration of NaOH × volume of NaOH added

Since we have equal volumes of HCl and NaOH at the equivalence point, we can simplify the equation to:

concentration of HCl = concentration of NaOH

Therefore, the concentration of HCl and NaOH at the equivalence point is both 0.15 M (the average of the initial concentrations of 0.20 M HCl and 0.10 M NaOH).

To find the pH at the equivalence point, we can use the equation for the dissociation of water:

H2O ⇌ H+ + OH-

At 25°C, the concentration of water is 55.5 M. At the equivalence point, the concentration of H+ and OH- are both equal, so we can write:

Kw = [H+][OH-]

where Kw is the ion product constant for water, which has a value of 1.0 × 10^-14 at 25°C.

At the equivalence point, the concentration of H+ and OH- are both equal to the concentration of NaOH and HCl, which is 0.15 M.

Therefore:

Kw = [H+][OH-]

1.0 × 10^-14 = [0.15][0.15]

[H+] = [OH-] = sqrt(1.0 × 10^-14) = 1.0 × 10^-7 M

The pH at the equivalence point is equal to the negative logarithm of the H+ concentration:

pH = -log[H+]

pH = -log(1.0 × 10^-7)

pH = 7.0

Therefore, the pH at the equivalence point for the titration of 0.20 M HCl versus 0.10 M NaOH is 7.0.

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Related Questions

Existen los super-genes.​

Answers

Group of linked genes acting as an allelic unit due to the suppression of crossing-over is called supergene.

What is meant by a supergene?

Chromosomal region encompassing multiple neighboring genes that are inherited together because of close genetic linkage is called supergene.

The best examples of supergenes are the morphologically and genetically distinct sex chromosomes which has evolved independently in many groups of animals and plants. Sex chromosomes evolve from autosomes via mutation that causes its bearers to develop into a male or female.

Supergenes arise following the establishment of mutations at minimum of two sites, followed by sequential accumulation of additional mutations.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: What is the meaning of supergene?

Which has a greater ionization level Li or Li2+

Answers

Compared to Li, Li2+ has a higher ionization level.

Has Li's ionization energy increased?

A smaller atom than Na is Li. As a result, Li has a stronger nucleus attraction for valence electrons than Na. Hence, Li's first ionisation energy is higher than that of a nucleus. Due to the size of the lithium ion, more solvent molecules can easily surround the cationic sphere.

Which Li n o ionization energy is the highest?

Going from left to right increases the ionisation energy. Ne therefore has the highest ionisation energy of all the elements. Lithium has a higher second ionization energy than beryllium because its valence electrons do not have enough electrons to protect its outer electrons.

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how do you find frequency from wavelength

Answers

The algorithm can be used to determine a wave's frequency if its wavelength is known: Frequency ⇒ 1/wavelength.

Define wavelength.

The extent of a wave is expressed by its wavelength. The wavelength is the distance between one wave's peak and the next wave's crest. The wavelength can also be determined by measuring from the "trough" (bottom) of one wave to the "trough" of the following wave.

Wavelength and frequency are inversely related. The number of waves that pass a fixed location in a unit of time is referred to as frequency. It also explains how many cycles or vibrations a body in periodic motion experiences in a given unit of time.

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What is the spring constant if 125J of energy is stored when a spring is compressed 0.300m?
2780N/m
833N/m
417N/m
1390N/m

Answers

The spring constant if 125J of energy is stored when a spring is compressed 0.300m is option A which is 2780N/m

Spring constant calculation.

The potential energy stored in a spring is given by the formula:

PE = (1/2) k x^2

where PE is the potential energy, k is the spring constant, and x is the displacement of the spring from its equilibrium position.

We can use this formula to find the spring constant if we know the potential energy stored and the displacement of the spring:

PE = (1/2) k x^2

Rearranging the formula gives:

k = 2PE / x^2

Substituting the given values into the formula gives:

k = 2(125 J) / (0.300 m)^2

k = 2780 N/m

Therefore, the spring constant is 2780 N/m.

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if 54.9g of aluminum hydroxide, al(oh)3, is neutralized with 91.9g of sulfuric acid, h2so4. how many grams of al₂(so₄)₃ will be produced

Answers

Answer:

120.2 g of aluminum sulfate will be produced

Explanation:

The balanced chemical equation for the reaction between aluminum hydroxide and sulfuric acid is:

2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O

According to the equation, it takes 2 moles of aluminum hydroxide to react with 3 moles of sulfuric acid to produce 1 mole of aluminum sulfate.

To find out how many grams of aluminum sulfate will be produced, we first need to calculate the number of moles of each reactant.

The molar mass of aluminum hydroxide (Al(OH)3) is:

Al = 26.98 g/mol

O = 15.99 g/mol (3 atoms)

H = 1.01 g/mol (9 atoms)

Total = 78.00 g/mol

Therefore, 54.9 g of aluminum hydroxide is equal to 54.9 g / 78.00 g/mol = 0.7038 moles of aluminum hydroxide.

The molar mass of sulfuric acid (H2SO4) is:

H = 1.01 g/mol (2 atoms)

S = 32.07 g/mol

O = 15.99 g/mol (4 atoms)

Total = 98.08 g/mol

Therefore, 91.9 g of sulfuric acid is equal to 91.9 g / 98.08 g/mol = 0.9361 moles of sulfuric acid.

Since 2 moles of aluminum hydroxide react with 3 moles of sulfuric acid to produce 1 mole of aluminum sulfate, the limiting reactant in this case is aluminum hydroxide, as it is present in the smaller amount.

The number of moles of aluminum sulfate produced can be calculated as:

0.7038 moles Al(OH)3 × (1 mole Al2(SO4)3 / 2 moles Al(OH)3) = 0.3519 moles Al2(SO4)3

The molar mass of aluminum sulfate (Al2(SO4)3) is:

Al = 26.98 g/mol (2 atoms)

S = 32.07 g/mol (3 atoms)

O = 15.99 g/mol (12 atoms)

Total = 342.15 g/mol

Therefore, the mass of aluminum sulfate produced is:

0.3519 moles Al2(SO4)3 × 342.15 g/mol = 120.2 g

Therefore, 120.2 g of aluminum sulfate will be produced.

Find the rate law of the experiment if the slope is 13.091 ml/s. And the equation is rate=k[h2o2][I^-]^y

Answers

The rate law of the experiment is rate = k[H2O2][I-]y, where k is the rate constant, H2O2 is the concentration of hydrogen peroxide, I- is the concentration of iodide ion, and y is the reaction order with respect to iodide ion.

What is hydrogen peroxide?

Hydrogen peroxide is a compound made up of two hydrogen atoms and two oxygen atoms (H2O2). It is a colorless, odorless liquid that is slightly more viscous than water and is a strong oxidizing agent. Hydrogen peroxide is highly reactive and is commonly used as a bleaching agent, disinfectant, and antiseptic. It can also be used as a fuel, oxidizer, and propellant. In the environment, hydrogen peroxide is formed naturally by the breakdown of organic matter, such as plants and animals, and is found in rain and snow.

The slope of the experiment, 13.091 ml/s, is equal to k[H2O2]y. Since the slope is 1, the rate law is rate = k[H2O2][I-]1, which means the reaction is first order with respect to iodide ion.

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What is the water of crystallization for a hydrate composed of 45.1% water? The anhydrous salt has a mass of 178 amu.

Answers

The 8 anhydrοus salt has a mass οf 178 amu..

What is mοle?

A mοle is the atοm's elementary particle, an iοn. The mοle οf the substance is always related tο the Avοgadrο number. The mοle is always assοciated with the weight οr mass οf the element οr substance. The standard unit οf a mοle is mοl. The mοle is a significant factοr οf the reactant and prοducts tο fοrm an equatiοn. A mοle calculates the atοm, iοn, and substance weighs.

The amοunt οf matter in a bοdy is referred tο as its mass. The kilοgrams is the kilοgrams, which is the SI unit οf mass (kg). Mass is defined as: Mass = Density /Vοlume.

mass οf water =45.1%    = 45.1 g

means that 45.1 g οf water in 100 g salt

hence mass οf anhydrοus salt(As)= 100 g  - 45.1 g =  54.9 g

mοlar mass οf anhydrοus salt (As) = 178 amu=178 g /mοl

mοlar mass οf water (H2O)=18.015 g /mοl

1st step:-     Find mοl οf  water

mοl οf water =   mass οf water /  mοlar mass οf water

=   45.1 g / 18.015 g /mοl

=  2.5035 mοl

2nd step:-      find mοl οf Anhydrοus salt

mοl οf  Anhydrοus salt (As) = mass οf anhydrοus salt /     mοlar mass οf anhydrοus salt

=     54.9 g  /  178 g /mοl

=  0.3084 mοl

3rd step:-calculate water οf crysatlisatiοn

=    mοl οf water  /   mοl οf  Anhydrοus salt    

=    2.5035 mοl /  0.3084

=  8.118  

=  8 (apprοx)

hence tοtal 8 mοl οf water present in Anhydrοus salt(As)   = As*8H20

Therefοre, 8 anhydrοus salt has a mass οf 178 amu.

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Question 3 (2 points)
I have a balloon with an initial temperature of 24 degrees Celcius and a volume of 9.2 liters. What will be the volume of the balloon when it is
taken outside if the outdoor temperature is 2 degrees Celcius?
Round your answer and report it to the tenths place followed by a space and the abbreviation for the unit. Ex: 9.2 cm
Blank 1:
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Time left for this
assessment:
55:30

Answers

Therefore, the volume of the balloon will be 8.7 L when taken outside at a temperature of 2 degrees Celsius.

What is volume?

Volume is a measure of the amount of space occupied by a three-dimensional object or substance. It is usually measured in cubic units, such as liters, cubic meters, or cubic feet. Volume can be calculated by multiplying the length, width, and height of an object (in the case of regular-shaped objects), or by using mathematical formulas or measurements of displacement (in the case of irregular-shaped objects or substances). Volume is an important concept in physics, chemistry, and engineering, as it is used to describe the behavior of gases, liquids, and solids, as well as the properties of various materials and substances.

Here,

To solve this problem, we can use the ideal gas law, which states that PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of gas, R is the gas constant, and T is the temperature of the gas in Kelvin.

To find the final volume of the balloon, we need to assume that the pressure and the number of moles of gas remain constant. Therefore, we can write:

P1V1/T1 = P2V2/T2

where P1 is the pressure at the initial temperature, T1 is the initial temperature in Kelvin, P2 is the pressure at the outdoor temperature, which we assume is the same as the initial pressure, and T2 is the outdoor temperature in Kelvin.

To convert Celsius to Kelvin, we add 273.15 to the Celsius temperature. Therefore, T1 = 24 + 273.15 = 297.15 K and T2 = 2 + 273.15 = 275.15 K.

Substituting the values into the equation, we get:

V2 = (P1/T1) x T2 x V1/P2

= (1 atm / 297.15 K) x 275.15 K x 9.2 L / (1 atm)

= 8.7 L (rounded to the nearest tenth)

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A doctor's order for 2.21 g of Keflex is available as 250 mg tablets. How many tablets of Keflex are needed? Please remember to include the correct unit with your answer.

Answers

Answer:

9 tablets.

Explanation:

2.21gg is 2210mg

2210/250= 8.84

what is the ionization constant for a 0.10 mole/dm3 of ethanoic acid solution which has a ph of 2.88​

Answers

The ionization constant (Ka) for a 0.10 M solution of ethanoic acid with a pH of 2.88 is [tex]5.82 * 10^(^-^5^)[/tex]

What does equilibrium constant mean?

The ratio of reactant to product amounts that is used to predict chemical behaviour is the definition of the equilibrium constant for a chemical process.

Ka = [H+][A-] / [HA]

where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

For ethanoic acid (also known as acetic acid), the ionization reaction is:

CH3COOH + H2O ⇌ CH3COO- + H3O+

pH = -log[H3O+]

The Ka expression can now be written as:

[tex]Ka = (x)^2 / (0.10 - x)[/tex]

At equilibrium, the value of x is very small compared to 0.10 M, so we can make the approximation that 0.10 - x ≈ 0.10.

Therefore, we can simplify the Ka expression to:

[tex]Ka = x^2 / 0.10[/tex]

To solve for x, we can use the equilibrium concentration of [H3O+] we calculated earlier:

[tex]x = [H3O+] = 7.68 * 10^(^-^3^) M[/tex]

Substituting this value into the simplified Ka expression, we get:

[tex]Ka = (7.68 * 10^(^-^3^))^2 / 0.10 = 5.82 * 10^(^-^5^)[/tex]

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Which of the following is not characteristic of a behavior?
a. It can be observed.
b.
It can be recorded.
C. It can be influenced by the environment.
d. It can include a person's thoughts.
Please select the best answer from the choices provided
ΟΑ
OB
OC
OD
Mark this and return
Save and Exit
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Submit

Answers

In the given options, there are some characteristics of behavior is given. The one which is not the characteristic of a behavior is "it can be recorded", b is correct.

What is behavior?

There are some actions and manners that are shown by humans or animals. It is induced by stimuli or inputs from the environment whether internal or external, conscious or subconscious, overt or covert, and voluntary or involuntary. For example -

When suddenly a person meets his or her relative then how that person reacts, whether he or she shows good manners or ignore them is part of their behavior.

Therefore, in the given options, there are some characteristics of behavior is given. The one which is not the characteristic of a behavior is "it can be recorded", b is correct.

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Which of the following is not an assumption in Bohr's theory. a) Energy is not dissipated when electrons move in an orbital b) Electrostatic force balances force tending to throw electron out of orbital c) Pairing of electrons reduces orbital stability d) Electrons move from one orbital to another by either absorbing or radiating energy​

Answers

Answer: C

Explanation: The assumption that pairing of electrons reduces orbital stability is not part of Bohr's theory.

Bohr's theory of atomic structure mainly focuses on the behavior of electrons in the atom and makes several key assumptions:

a) Energy is not dissipated when electrons move in an orbital (postulate of quantization)

b) Electrostatic force balances force tending to throw electron out of orbital (Coulomb's law)

d) Electrons move from one orbital to another by either absorbing or radiating energy (postulate of transitions)

Therefore, the correct answer is option (c) Pairing of electrons reduces orbital stability.

In an isosceles right triangle, the length of the hypotenuse is 6 units. Which measurement is NOT associated with the triangle?

a. 45° degrees


b. 90° degrees


c. 6√2


d. 3√2

(30 points)

Answers

Answer:

Therefore, the answer is none of the above; all options are associated with the triangle.

Explanation:

In an isosceles right triangle, the two legs are congruent, and each angle other than the right angle is 45 degrees. Since the hypotenuse of the triangle is 6 units, each leg has a length of:

leg length = hypotenuse / √2 = 6 / √2

This can be simplified by multiplying the numerator and denominator by √2:

leg length = (6 / √2) * (√2 / √2) = 6√2 / 2 = 3√2

Therefore, the length of each leg is 3√2 units.

Option (c) 6√2 is associated with the triangle as it is the length of the hypotenuse.

Option (a) 45° degrees is associated with the triangle as it is one of the acute angles of the isosceles right triangle.

Option (b) 90° degrees is associated with the triangle as it is the right angle of the isosceles right triangle.

Option (d) 3√2 is associated with the triangle as it is the length of each leg of the isosceles right triangle.

Therefore, the answer is none of the above; all options are associated with the triangle.

PLS HELP ASAPPP !!! WILL GIVE BRAINLIEST

Answers

the first cart will have a bigger change in motion because it is going faster at the end and the front of the cart. second one is less in motion because the speed is much slower. (shown by the arrows of which direction and how fast they are moving) im not sure on how to compare them sorry

The diagram below shows a gas with an initial pressure of 3060 mm Hg in a cylinder constant temperature. The gas expands inside the cylinder and pushes the piston

Answers

the final pressure of the gas inside the cylinder is 784 mm Hg.

What is Boyle's law?

To solve this problem, we can use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature. Mathematically, this can be written as:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

Substituting the given values into the equation, we get:

3060 mm Hg x 0.520 L = P2 x 2.03 L

P2 = (3060 mm Hg x 0.520 L) / 2.03 L

P2 = 784 mm Hg

Therefore, the final pressure of the gas inside the cylinder is 784 mm Hg.

The answer is (B) 784 mm Hg.

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If 62.0 grams of magnesium metal react with excess hydrochloric acid, how many liters of hydrogen gas can be produced at 200.0 K and 0.945 atmospheres? Mg + 2HCl → H2 + MgCl2

Answers

Volume that the hydrogen gas occupying = V Three moles of hydrogen are present. V = 74.04 L for PV=nR.

What is hydrogen fuel, sometimes known as H2?

Hydrogen is typically a gas with the formula H 2 made up two diatomic molecules. It is exceedingly combustible, tasteless, colorless, odorless, & non-toxic. Hydrogen is the most common chemical in the universe, accounting for around 75% of any and all ordinary matter.

How is gaseous hydrogen made?

High-Temperature Water Splitting: Chemical reactions which split water into hydrogen are fueled by high temperatures generated by light concentrators or nuclear reactors. Photobiological Water Splitting: Bacteria, such as alga, consume water with in presence of sunshine and make hydrogen as a byproduct.

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HELP! ILL MARK YOU AS BRAINLIST



The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 400.
g of pure Cu
Express your answer to three significant figures and include the appropriate
units.

Answers

To solve this problem, we need to use the molar mass of copper and the stoichiometry of the balanced equation to determine how much chalcopyrite is needed to produce 400 g of pure copper.

The molar mass of copper is 63.55 g/mol, which means that 1 mole of copper contains 63.55 grams of copper. Using this information, we can convert 400 g of copper to moles:

400 g Cu x (1 mol Cu/ 63.55 g Cu) = 6.292 mol Cu

From the balanced equation of the reaction, we know that 1 mole of chalcopyrite (CuFeS2) produces 1 mole of copper. Therefore, we need to mine the same number of moles of chalcopyrite as the number of moles of copper required.

To determine the number of moles of chalcopyrite needed, we can use the molar mass of chalcopyrite:

Molar mass of CuFeS2 = (1 x atomic mass of Cu) + (1 x atomic mass of Fe) + (2 x atomic mass of S)

= (1 x 63.55 g/mol) + (1 x 55.85 g/mol) + (2 x 32.06 g/mol)

= 183.53 g/mol

Now we can convert the moles of copper to moles of chalcopyrite:

6.292 mol CuFeS2 x (183.53 g CuFeS2/ 1 mol CuFeS2) = 1154.4 g or 1.1544 kg of CuFeS2

Therefore, we need to mine 1.1544 kg of chalcopyrite to obtain 400 g of pure copper.

Why do carbon, silicon, and germanium share many chemical properties?

o They have the same atomic mass.

o They have the same atomic number.

o They have the same ratio of electrons to protons.

o They have the same electron configuration.​

Answers

Answer:

Carbon, silicon, and germanium share many chemical properties because they belong to the same group in the periodic table, which is group 14 (also known as the carbon group). The elements in this group have the same number of valence electrons (4), which gives them similar chemical properties.

The correct option is: They have the same number of valence electrons (4), which gives them similar chemical properties.

Explanation:

If the initial rate does not double nor stay the same (as in it times itself by 1.1-1.9 times) then is the exponent to the power of 1 or to the power of 0?

Answers

The exponent to the power of 0 would be the correct answer in this situation.

What is initial rate?

Initial rate is the rate of reaction at the beginning of a chemical reaction. It is usually measured at the start of the reaction and is usually higher than the rate at equilibrium. The initial rate is an important factor in determining the rate of reaction and the products of the reaction. It can be used to determine the effects of various factors such as temperature, pressure, and concentration on the reaction rate.

Exponents represent the number of times the base number is multiplied by itself. So, if the rate does not double nor stay the same, then it is not being multiplied by itself, so the exponent would be to the power of 0.

Exponentiation can be used to show how many times a number is multiplied by itself, and this is done by raising the base number to a certain power. For example, 4 to the power of 3 means 4 x 4 x 4 = 64. In this case, the exponent is 3.

If the initial rate does not double nor stay the same, then the power associated with the exponent would be 0. This is because the rate is not being multiplied by itself, so it would not be associated with any power. Therefore, the exponent would be to the power of 0.

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Calculate molarity, molality and normality
20 g NaOH dissolved in 600 mL of solution (d=1.10 g/mL)
50 g Ba(OH)2 dissolved in 800 mL of solution (d=1.15 g/mL)
40 g H3PO4 dissolved in 900 mL of solution (d=1.30 g/mL)
25 g Na2CO3 dissolved in 1000 mL of solution (d=1.05 g/mL)

Answers

Answer:

Explanation:

For NaOH:

Molarity = moles of solute / liters of solution

Molality = moles of solute / mass of solvent (in kg)

Normality = equivalents of solute / liters of solution

First, we need to find the moles of NaOH:

moles of NaOH = mass of NaOH / molar mass of NaOH

moles of NaOH = 20 g / 40 g/mol

moles of NaOH = 0.5 mol

Next, we need to find the liters of solution:

liters of solution = 600 mL / 1000 mL/L

liters of solution = 0.6 L

Now we can calculate the molarity:

Molarity = 0.5 mol / 0.6 L

Molarity = 0.833 M

To find the molality, we need to find the mass of the solvent (water) in kg:

mass of solvent = volume of solution x density of solvent

mass of solvent = 0.6 L x 1.10 g/mL

mass of solvent = 0.66 kg

Now we can calculate the molality:

Molality = 0.5 mol / 0.66 kg

Molality = 0.758 mol/kg

Finally, to find the normality, we need to know that NaOH is a monoprotic base (i.e. donates one H+ ion per molecule). Therefore, the equivalents of NaOH is equal to the moles of NaOH:

Normality = 0.5 eq / 0.6 L

Normality = 0.833 eq/L

For Ba(OH)2:

Molarity = moles of solute / liters of solution

Molality = moles of solute / mass of solvent (in kg)

Normality = equivalents of solute / liters of solution

First, we need to find the moles of Ba(OH)2:

moles of Ba(OH)2 = mass of Ba(OH)2 / molar mass of Ba(OH)2

moles of Ba(OH)2 = 50 g / (137.33 g/mol x 2)

moles of Ba(OH)2 = 0.182 mol

Next, we need to find the liters of solution:

liters of solution = 800 mL / 1000 mL/L

liters of solution = 0.8 L

Now we can calculate the molarity:

Molarity = 0.182 mol / 0.8 L

Molarity = 0.227 M

To find the molality, we need to find the mass of the solvent (water) in kg:

mass of solvent = volume of solution x density of solvent

mass of solvent = 0.8 L x 1.15 g/mL

mass of solvent = 0.92 kg

Now we can calculate the molality:

Molality = 0.182 mol / 0.92 kg

Molality = 0.198 mol/kg

Finally, to find the normality, we need to know that Ba(OH)2 is a diprotic base (i.e. donates two H+ ions per molecule). Therefore, the equivalents of Ba(OH)2 is twice the moles of Ba(OH)2:

Normality = 0.364 eq / 0.8 L

Normality = 0.455 eq/L

Molarity of H3PO4:

First, calculate the number of moles of H3PO4:

m(H3PO4) = 40 g

Molecular weight of H3PO4 = 3(1.01) + 1.01 + 4(16) = 98 g/mol

n(H3PO4) = m(H3PO4) / M(H3PO4) = 40 g / 98 g/mol = 0.4082 mol

Now, calculate the volume of the solution in liters:

V = 900 mL = 0.9 L

Molarity (M) = n / V = 0.4082 mol / 0.9 L = 0.4536 M

Molality of H3PO4:

Mass of solvent (water) = (900 mL) x (1.30 g/mL) - 40 g = 1040 g

Molality (m) = n(H3PO4) / m(solvent) = 0.4082 mol / 1.040 kg = 0.3929 m

Normality of H3PO4:

H3PO4 is a triprotic acid, meaning that it can donate up to three protons (H+ ions) per molecule. The normality of H3PO4 depends on which proton(s) we are interested in. Here, we will calculate the normality with respect to the first proton.

One mole of H3PO4 can donate three moles of H+ ions, so the equivalent weight (the weight that can donate one mole of H+ ions) of H3PO4 is its molecular weight divided by three:

Equiv. Wt. = 98 g/mol / 3 = 32.67 g/mol

Normality (N) = Molarity x Number of H+ ions donated per molecule / Equivalent weight

For the first proton, the number of H+ ions donated per molecule is 1. Therefore:

N = 0.4536 M x 1 / 32.67 g/mol = 0.01388 N

First, we need to calculate the number of moles of Na2CO3:

Molar mass of Na2CO3 = 2(23) + 12 + 3(16) = 106 g/mol

Number of moles of Na2CO3 = mass/molar mass = 25 g / 106 g/mol = 0.235 moles

Next, we can calculate the molarity, molality and normality using the following formulas:

Molarity = moles of solute / liters of solution

Molarity = 0.235 moles / 1 L = 0.235 M

Molality = moles of solute / mass of solvent (in kg)

Density of solution = 1.05 g/mL = 1050 kg/m³

Volume of solution = 1000 mL = 1 L

Mass of solvent = volume of solution x density of solution = 1 L x 1050 kg/m³ = 1050 g = 1.05 kg

Molality = 0.235 moles / 1.05 kg = 0.224 mol/kg

Normality = (moles of solute x equivalent weight) / liters of solution

The equivalent weight of Na2CO3 is equal to its molar mass divided by the number of hydrogen ions it can donate in a reaction, which is 2.

Equivalent weight of Na2CO3 = molar mass / 2 = 106 g/mol / 2 = 53 g/eq

Normality = (0.235 moles x 53 g/eq) / 1 L = 12.455 N

Explain energy transfer between a cup of water and the air in a room if they are in equilibrium. How can this be measured?

Answers

Answer:

Convection. Convection is the transfer of heat by actual movement of mass within a fluid. Convection is a very important means of energy transport in the atmosphere, especially moist convection.

(I'm not so sure abt this, but worth a a shot!)

Good luck!

Which molecule has a double bond
And explain how you know

Answers

Answer:

The ans is simple: O2

Explanation:

Oxygen has 6 electrons on its outer shell and to be in stable form it shares 2 electrons with the other one and forms double bond.

What volume of carbon dioxide can be produced from the combustion of 2.0 L of methane at STP?

CH4( g ) + 2O2( g ) → CO2( g ) + 2H2O( g )

Answers

Answer:
The balanced chemical equation for the combustion of methane shows that for every one mole of methane (CH4) reacted, one mole of carbon dioxide (CO2) is produced.

Using the ideal gas law, we can calculate the number of moles of methane in 2.0 L at STP:

PV = nRT

(1 atm)(2.0 L) = n(0.0821 L•atm/mol•K)(273 K)

n = 0.0828 mol

Therefore, 0.0828 mol of methane reacts to produce 0.0828 mol of carbon dioxide.

We can use the ideal gas law again to find the volume of carbon dioxide produced at STP:

PV = nRT

(1 atm)(V) = (0.0828 mol)(0.0821 L•atm/mol•K)(273 K)

V = 1.92 L

Therefore, 1.92 L of carbon dioxide can be produced from the combustion of 2.0 L of methane at STP.

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Why is a different product formed at the anode when copper sulfate is electrolysed using graphite electrodes rather than copper electrodes?

Answers

Because both S0₄⁻ and OH⁻ ions are attracted to the anode, however OH⁻ ions are more reactive (readily discharged) which means oxygen is produced as there is no copper atoms in the graphite electrode to form ions.

number 4, i just need an explanation on how to solve these—big test tomorrow

Answers

Cl2 is the limiting reactant and the unreacted Al is 1.7 g

What is the limiting reagent?

We know that the reaction equation is;

2Al + 3Cl2 ------> 2AlCl3

Now we know that;

Number of moles of Al = 2.7/27 g/mol

= 0.1 moles

Number of moles of Cl2 = 4.0 g/71 g/mol

= 0.056 moles

If 2 moles of Al reacts with 3 moles of Cl2

0.1 moles of Al reacts with 0.1 * 3/2

= 0.15 moles

The Cl2 is the limiting reactant

Now;

2 moles of Al reacts with 3 moles of Cl2

x moles of Al reacts with 0.056 moles of Cl2

x = 0.037 moles

Moles of unreacted Al = 0.1 moles - 0.037 moles

= 0.063 moles

Mass of unreacted Al =  0.063 moles * 27 g/mol

= 1.7 g

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What is the net ionic equation of
2H+ + SO2 + Ca²+ + 2I → CaSO4 + 2H+ + 2I?
A. H₂SO4(aq) + Cal₂(aq) → CaSO4(s) + 2Hl(aq)

B. 2H+ + SO2 + Ca²+ → CaSO4 + 2H*

C. H+ + SO4²+ Ca²+ + 2I→CaSO4+H*+ I

D. SO4²+ Ca²+ → CaSO4

Answers

Answer:

The net ionic equation of 2H+ + SO2 + Ca²+ + 2I → CaSO4 + 2H+ + 2I is C. H+ + SO4²+ Ca²+ + 2I→CaSO4+H*+ I. This equation describes the process of a single replacement reaction, where the hydrogen ions and iodide ions react with the sulfate and calcium ions to form the insoluble compound of calcium sulfate and the remaining hydrogen and iodide ions

Explanation:

Consider the following reaction.

2NO2(g)⇌N2O4(g)

When the system is at equilibrium, it contains NO2
at a pressure of 0.716 atm
, and N2O4
at a pressure of 0.0513 atm
. The volume of the container is then reduced to half its original volume. What is the pressure of each gas after equilibrium is reestablished?

Answers

The pressure of NO2 after equilibrium is re-established is 1.432 atm and that of N2O4 is 0.1026 atm.

How do you calculate the pressure of each gas after equilibrium is reestablished?

Writing the equilibrium expression for the specified reaction is the first step.

Kp is equal to (P(N2O4))²/(P(NO2))²

Next, using the partial pressures of NO2 and N2O4 at equilibrium provided, we must determine the value of the equilibrium constant Kp.

Kp = (0.0513)2 / (0.716)2 = 0.00201

The new equilibrium partial pressures of NO2 and N2O4 are P'(NO2) and P'(N2O4), respectively. Then:

P'(NO2)=2 x 0.716 = 1.432 atm

P'(N2O4) is equal to two times 0.0513 atm.

Last but not least, we may determine whether the new equilibrium partial pressures satisfy the expression for the equilibrium constant:

Kp = (P'(N2O4))²/ (P'(NO2)² = (0.1026) (0.1026)² / (1.432) (1.432)² = 0.00201

As a result, when equilibrium is restored, the pressures of NO2 and N2O4 are both 1.432 atm for NO2 and 0.1026 atm for N2O4, respectively.

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Based on the balanced chemical equation, 2Al(s) + 3H₂SO4(aq) -> Al2(SO4)3(aq) + 3H2(g), how much 4.00 M sulfuric acid is needed to produce 2 moles of aluminum sulfate?​

Answers

Aluminum sulfate is very non-toxic, having acute and chronic oral LD50 values above 5,000mg/kg (5). Alum, on the other hand, can cause irritation, burns, and breathing problems.

What is Aluminium sulfate used for?

Aluminum sulfate is a crystalline (sand-like) solid that is odorless, white or colorless. It is utilized in sewage treatment, water purification, paper production, and leather tanning. Aluminum sulfate is also known as alum or papermaker's alum; however, the term "alum" refers to any double sulfate salt having the general formula XAl(SO4)212H2O, where X is a monovalent cation such as potassium or ammonium (5).

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PO3-


2.64 Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair.


Ion


02-


Na


Ca2+


Fe2+


A13+


Na2O


NO3


AsO43-

Answers

The completed table that fills the formula for the ionic compound has been given below:

How to solve

To form an ionic compound from the given cation and anion we need to balance the charges of the cation and anions.

For example: Suppose we have a cation C3+ and an anion A-. Thus, to balance the charge we need 1C3+ and 3A-, the formula of the ionic compound formed CA3.

Ion K+ NH4+ Mg2+ Fe3+

Cl- KCl NH4Cl MgCl2 FeCl3

OH- KOH NH4OH Mg(OH)2 Fe(OH)3

CO32- K2CO3 (NH4)2CO3 MgCO3 Fe2CO3

PO43- K3PO4 (NH4)3PO4 Mg3(PO4)2 FePO4

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The mass of sodium acetate produced in the following reaction is 123 grams. NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2 What mass of carbon dioxide and water are produced? Show how you get the answer 66 g CO , 27 g H2O

Answers

Thus, the mass of  carbon dioxide created is 66.02 g, while the volume of water produced was 27.03 g.

How does carbon dioxide affect the body?

Many health impacts from CO2 exposure may occur. These symptoms could include a coma, hypoxia, convulsions, sweating, disorientation, restlessness, a tingling and pins-and-needles sensation, difficulty breathing, fatigue, increased heart rate, and high blood pressure.

Are people harmed by carbon dioxide?

Through inhalation, CO2 is regarded as having low toxicity. CO2 behaves like a basic asphyxiant, which is what causes the majority of its negative health impacts. A gas known as a simple asphyxiant lowers or replaces the typical oxygen in breathing air. Headache and sleepiness are two signs of modest CO2 exposure.

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