The pH at the equivalence point will be 4.028
Volume of NaOCl = 20.00 ml
Volume of HCl = 28.30 ml
Molarity of HCl = 0.50 M
Ka = 3.0 × 10⁻⁸ (missing in question)
pH of solution at eq. point = ?
Write the chemical equation
NaOCl + HCl → HOCl + NaCl
Initial concentration of reactants and products are as:
NaOCl = 20 × M
HCl = 28.3 × 0.50
HOCl = 0
NaCl = 0
Equivalence point concentration of reactants and products are as:
NaOCl = 0
HCl = 0
HOCl = 28.3 × 0.5
NaCl = 28.3 × 0.5
As NaCl is a neutral salt so we take the concentration of HOCl
[HOCl] = 28.3 ml × 0.5 M / 48.3 ml (total volume)
[HOCl] = 0.2929 M
Now calculate the pH
pH = 1/2 [pKa - log C]
pH = 1/2 [ (8 - log 3) - log 0.2929]
pH = 4.028
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a buffer is formed by adding 1.0 mol of methylamine, ch3nh2, and 1.0 mol of methylammonium, ch3nh3 , in a 1.0 l container. if a 10.0 ml sample of this buffer is diluted to 1000 ml with water, what is the ph of the diluted buffer? for methylamine, kb
If a 10.0 ml sample of this buffer is diluted to 1000 ml with water,the ph of the diluted buffer is 9.26.
pH of Buffer Solution can be calculated as :
pH = pKa - log ( [ Salt ] / [ Base ] )
Since Kb = 1.8 x 10-5
then , pKb = 4.74
Since , pKa + pKb = 14 \Rightarrow pKa = 9.26
Initial concentration of NH3 and (NH4)+ is 1 M.
Now 10 mL of the sample is taken and diluted to 1000 mL
Since , M1V1 = M2V2
Where M1 is the Molarity of the solution before dilution and V1 is the volume taken ( M1 = 1 M ; V1 = 10 mL)
M2 is the Molarity of the solution after dilution and V2 ( V2 =1000 mL ) is the Final volume of the solution.
M2 = M1V1 / V2 \Rightarrow M2 = ( 1 x 10 ) / 1000 = 0.01 M .
Final concentration of NH3 and (NH4)+ in the sample is 0.01 M.
then , [ Salt ] / [ Base ] = 1
Since , log( 1 ) =0
Then pH = pKa = 9.26
The pH of the Buffer solution is 9.26.
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how many grams of water ( h2o ) have the same number of oxygen atoms as 9.0 mol of oxygen gas? express your answer in grams.
162 grams of water have the same no. of oxygen atoms as 9.0 mol of oxygen gas.
1 mol of oxygen contains 6.023 * 10 [23] oxygen atoms.
That means 9.0 mol of oxygen gas is equals to 9*6.023*10[23] oxygen atoms .
To calculate the grams of water which will have 9*6.023*10[23] atoms of oxygen.
We have to know that in 18gms of water 1 oxygen atom is present.
So, for 9 oxygen atoms we will multiply with 18 that is 162 gms.
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A balloon filled with room temperature air and then put in a sunny place expands slightly due to a rise in temperature. This due to the molecules of air
A balloon filled with room temperature air and then put in a sunny place expands slightly due to a rise in temperature and this is because the molecules of air are moving faster.
Why does this happens?The volume occupied by the air inside the balloon and the pressure exerted by the air particles on the balloon wall increases. The sun's temperature is higher than room temperature.Because the sun is hotter than room temperature, the volume of air inside the balloon increases.This is because the volume occupied by a gas is directly proportional to its temperature at constant pressure (Charles' law) volume ∝ temperatureThe pressure on the balloon from an external source does not change, but as the volume of the balloon increases, the pressure exerted on the balloon walls by the air particles increases.The average kinetic energy of gas molecules increases with sun's hotness. what is charle's law?Charles' law is an experimental gas law that describes how gases expand when heated. A modern statement of Charles' Law is that Kelvin temperature and volume are directly related if the pressure on a dry gas sample is held constant .
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you are working diligently in the chemistry laboratory when suddenly a small explosion occurs in the rear of the room, immediately and automatically capturing your attention. this is an example of
When you are working diligently in the chemistry lab, when suddenly a small explosion occurs in the rear of the room , immediately and automatically capturing your attention, this is an example of Reflexive attention.
What is reflexive attention?
Reflexive attention is essentially a semi-autonomous decision making system.
The brain regulates vital body functions such as heartbeat, movements and learning processes. Also, the brain controls the psychological processes such as memory, wakefulness, and attention.
Attention is categorized into two groups; voluntary and reflexive.
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a student places a piece of i2(s) in 50.0 ml of h2o(l), another piece of i2(s) of the same mass in 50.0 ml of c6h14(l), and shakes the mixtures. the results are shown above. what do the results indicate about the intermolecular interactions of the substances?
When a piece of I2 in 50 ml of water is placed then another piece of I2 of the same mass in C6H14 is placed then hydrogen bonding is formed in water and a strong London dispersion force occurs.
C6H14 is a straight chain alkane with 6 carbon atoms with no double or triple bond.this is non polar. So, London dispersion forces exist.this is the force that exists between all molecule.this is the weakest intermolecular forces.the boiling point of C6H14 increases as their atomic mass increases due to stronger London dispersion force.
Water has strong intermolecular forces.in this,hydrogen bonding and dipole moment created by the strong electronegative oxygen and hydrogen.water has hydrogen bond,dipole induced dipole forces and London dispersion forces.
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(c) if 54.8 ml of bacl2 solution is needed to precipitate all the sulfate in a 534 mg sample of na2so4 (forming baso4), what is the molarity of the solution?
The molarity of the solution is 66.207 M.
1) number of moles of Na2SO4
number of moles = mass/molar mass = 534/142 = 3.7605633 moles
To precipitate 3.7605633 moles of Na2SO4 we need the same amount of moles of BaCl2 = 3.7605633 moles.
2) molarity of BaCl2 solution
concentration = number of moles/volume = 3.7605633/0.0568
= 66.20710 M
Molarity is defined as the total number of moles of solute in one kilogram of solvent. Molarity is also called molarity.
The symbol for molarity is a capital M. In chemistry, a solution is a mixture of two or more substances in which none of the substances are chemically changed. The formula for calculating molarity is the ratio of the moles of solute for which the molarity is calculated and the volume of solvent used to dissolve the particular solute.
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silicon dioxide is found in sand, quartz glass, and silica gel packets found in packaging of shoes and electronics. what is the formula for silicon dioxide?
Silicon dioxide is found in sand, quartz glass, and silica gel packets found in packaging of shoes and electronics. the formula for silicon dioxide is SiO₂.
The formula for silicon dioxide is SiO₂. silicon dioxide is called as silica. silicon dioxide is commonly found in quartz. it is transparent solid. it is used in adhesives, ceramics. it is also used in agriculture chemicals. white and whitish yellow as sand or powder. it is the main part in optical fiber.
Thus, Silicon dioxide is found in sand, quartz glass, and silica gel packets found in packaging of shoes and electronics. the formula for silicon dioxide is SiO₂.
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The residents asked the town planners to propose some possible solutions that will address their transportation concerns and reduce the amount of CO2 released into the atmosphere. Of these, which is your favorite solution:
Question 3 options:
Restrict the use of private vehicles powered by fossil fuels on public roads.
Promote vehicles powered by renewable energy sources to harvest the crops and get them to market.
The solution for addressing transportation concerns and reducing the amount of carbon dioxide released into the atmosphere might include promoting vehicles powered by renewable energy sources to harvest the crops and get them to market (Option B).
What are renewable energy sources?The expression renewable energy sources make reference to different types of energy that replace the use of fossil based fuels in order to avoid the increase in the carbon dioxide level.
Therefore, with this data, we can see that renewable energy sources such as wind energy or solar energy replace fossil based fuels.
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Can yall help me with this
Answer:
A planetary scientist who works at john hopskin university
Explanation:
the total translational kinetic energy of 17 moles of an ideal gas is 198,242 j. calculate the gas temperature in kelvin
The total translational kinetic energy of 17 moles of an ideal gas is 198,242 j . the gas temperature in kelvin is 937 K.
Given that :
total translational kinetic energy = 198242 J
moles = 17 mol = 17 × 6.023 × 10²³
Total kinetic energy = ( 3/2 KT ) × no. molecules
198242 = ( 3/2) ( 1.38 × 10⁻²³ ) T × 17 × 6.023 × 10²³
T = 198242 / 211.84
T = 937 K
Thus, The total translational kinetic energy of 17 moles of an ideal gas is 198,242 j . the gas temperature in kelvin is 937 K.
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Which model was developed after alpha particles were bombarded onto sheets of gold?.
After alpha particles were bombarded onto sheets of gold, the Rutherford model was developed. This model proposed that the atom was composed of a small, dense, positively charged core called the nucleus, with electrons orbiting around this nucleus.
The Rutherford model is a model of the atom that was proposed by Ernest Rutherford in 1911. It was based on his experiments with alpha particles. In the model, the atom is composed of a small, dense nucleus with positive charge surrounded by electrons that orbit the nucleus. The Rutherford model is unable to explain the stability of atoms and the nature of the electromagnetic force, but it did provide a starting point for the development of more sophisticated models of the atom.
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which compound has the shortest carbon-carbon bond length? which compound has the shortest carbon-carbon bond length? ch2ch2 ch3ch3 hcch all bond lengths are the same.
Out of all the compounds - ch2ch2 (Ethylene), ch3ch3 (Ethane)and hcch the compound with the shortest bond length is hcch (Ethyne)
Bond length is the equilibrium distance between the nuclei of two groups or atoms that are bonded to each other.
Bond length depends upon bond strength and is inversely proportional to it, therefore longer the length of bond, less the bond strength.
CH3-CH3 is Ethane, the C-C bond is a single bond.
CH2=CH2 is Ethylene, the C-C bond is a double bond.
CHCH is Ethyne, the C-C bond is a triple bond.
As we know, Bond length and bond strength gets shorter and stronger as the number of bonds between the two atoms increases. Here single bond has the largest bond length and triple has the shortest bond length.
So, in order of C-C bond length (longest to shortest) you have ethane > ethylene > ethyne
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Identify the calculations possible using only 28. 02 g/mol as a conversion factor.
The calculations possible using only 28.02 g/mol as a conversion factor are:
The grams of N2 in 5.03 x 10^20 moles of nitrogen gas.The moles of N2 in 3.94 grams of nitrogen gas.How to do the conversion in chemistry?One of many ways to do a conversion in chemistry is by using the conversion factor. It is an arithmetical multiplier for converting a quantity of a unit to the equivalent expressed in another.
Given the conversion factor of 28.02 g/mol (molar mass of nitrogen), we could calculate the grams of N2 in 5.03 x 10^20 moles of nitrogen gas. We also can calculate the moles of N2 molecules in 3.94 grams of nitrogen gas by using 28.02 g/mol as the conversion factor.
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please help!!
(this is Rutherford's Black box experiment)
- please answer all the questions in full sentences :D
- do not answer "i'm not sure" on here.
1) Suppose the marble usually rolled right to the end of the box without bouncing off anything, what would this tell you about the size of the targets?
2) What conclusions did Rutherford draw from his data and how did the data change the model of the atom?
3) Niels Bohr was a student of Rutherford, Bohr's work went on to modify the atomic model even more. What changes did Bohr make to advance our understanding of the atom?
Answers:
1) If the marble usually rolls right to the end of the box without bouncing off anything, this indicates that the size of the targets is appropriate for the marble.
2) Rutherford's data led him to conclude that atoms are mostly empty space, with a very small, very dense nucleus at the center. This data changed the model of the atom from a solid, indivisible sphere to a mostly empty space with a small, dense nucleus.
3) Bohr's model of the atom was an improvement on Rutherford's model. Bohr made the following changes:
proposed that electrons orbit the nucleus in discrete energy levelsexplained the stability of atoms by postulating that electrons can only occupy certain energy levelsproposed that when an electron jumps from one energy level to another, it emits or absorbs a photon with an energy equal to the difference in the energy levelsThese changes helped to explain the spectral lines of atoms and the stability of atoms.
Which element has the ground state electronic configuration, 1s22s22p63s23p64s1 ?.
Potassium is the element that has the ground state electronic configuration, 1s22s22p63s23p64s1.
The electronic configuration describes the distribution of electrons in their atomic orbital. In an electronic Configuration, subshells that contain electrons, and the total number of electrons in each of the subshells are written in a sequence.
It is used to find out the valency of an element, Predict the properties of a group of elements and Interpret atomic spectra.
The subshells are s, p, d, and f and the total number of electrons that they can hold is 2, 6, 10, and 14 respectively.
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the pressure of a sample of argon gas was increased from 3.34 atm to 8.18 atm at constant temperature. if the final volume of the argon sample was 14.8 l, what was the initial volume of the argon sample? assume ideal behavior.
The initial volume of the argon gas sample at a constant temperature is 36.24 L.
Let the initial pressure and initial volume be P and V respectively
And the final pressure and volume be P' and V' respectively
At constant temperature, for the given sample,
P = 3.34 atm
V = ?
P' = 8.18 atm
V' = 14.8 L
The ideal gas law is PV = nRT,
At constant T (temperature), PV = constant
According to Boyle's law, the product of the pressure and volume of an ideal gas at constant temperature is constant.
For ideal gas argon at a constant temperature, using Boyle's law we get
P * V = P' * V'
3.34 * V = 8.18 * 14.8
V = 121.06 / 3.34
∴ V = 36.24 L
Thus at 3.34 atm and constant temperature, the volume of a sample of agon gas is 36.24 L
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How many spaces have been left for the possible discovery of new elements?
this is the answer to ur question hope is helpful
Which statement correctly describes the bonding in metals? * (1 Point)
A) lattice of negative ions in a sea of electrons
B) lattice of positive ions in a sea of electrons
C) lattice of neutral atoms with delocalised electrons.
D) lattice of negative ions with delocalised electrons.
Answer:
C) lattice of neutral atoms with delocalised electrons
Explanation:
Fact 1: metals are elements and therefore they contain atoms that are electrically neutral
Fact 2: in all atoms, the electrons are delocalised/ are free moving electrons (as the electrons serve their purpose in different forms depending whether you look at it the chemistry way or physics way)
metals are solid and hence they have a lattice structure
(tho at my school we focus on giant ionic lattice structure when explaining based on ionic compounds so i can't guarantee that 'giant ionic lattice structure' and 'lattice structure' are the same, hence i just stick with lattice structure for this explanation ^^)
explanation for other options:
they said negative/positive ions which is not true since atoms are electrically neutral
only when the atoms undergo chemical reactions will they be charged
Zn(s)+HNO3(aq)⟶Zn(NO3)2(aq)+H2(g)
Express your answer as a chemical equation. Identify all of the phases in your answer. Keep the order of compounds as in the original equation.
Start by assigning oxidation numbers to the atoms that take part in the reaction.
notice that the oxidation state of zinc changes from zero on the reactants' side to +2 on the products' side, which means that it is being oxidized.
Now take a look at nitrogen's oxidation state. Notice that some nitrogen atoms keep their oxidation state constant, i.e. +5 on both sides of the equation, but that other nitrogen atoms change their oxidation state from +5 to -3, which implies that they are being reduced. Balance the nitrogen atoms first by multiplying the nitric acid by 2. Since you're in acidic solution, you can balance the hydrogen atoms by adding protons,
H
+
, to the side that lacks hydrogen, and oxygen atoms by adding water molecules to the side that lacks oxygen.
Since you only need to balance the hydrogen atoms present on the reactants' side.
Hope that can start you off! And hope that helps!
The balanced chemical equation of the given reaction is written as follows:
[tex]\rm Zn(s)+2HNO_3(aq) \rightarrow Zn(NO_{3})_2(aq)+H_2(g)[/tex]
What is a balanced chemical equation?A balanced chemical equation is a symbolic representation of a chemical reaction that shows the exact number of atoms of each element present in both the reactants and the products.
In a balanced equation, the total number of atoms of each element on the reactant side of the equation must be equal to the total number of atoms of that element on the product side of the equation.
This ensures that the law of conservation of mass is upheld, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged.
The balanced chemical equation is written above.
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select all that apply select all the statements that correctly describe steps in the procedure used to identify a limiting reactant. multiple select question. the maximum product possible is given by the sum of the amounts of product formed from each reactant. the reactant that produces the least amount of possible product is the limiting reactant. the reactant that has the highest mass at the beginning of the reaction is in excess. calculate the molar masses of any reactants for which a mass has been given. calculate the amount of product that could be formed from each reactant.
Step 1: Begin with a balanced chemical equation and starting amounts for each reactant.
Step 2: Convert mass of each starting reactants to moles.
Step 3: Calculate the number of moles used for each reactant. is the limiting reagent.
what is limiting reaction?
The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.The reactant that is entirely used up in a reaction is called limiting reagent. In the reaction given above, 3 moles of Hydrogen gas are required to react with 1 mole of nitrogen gas to form 2 moles of ammonia.Determine which reactant is limiting by dividing the number of moles of each reactant by its stoichiometric coefficient in the balanced chemical equation. Use mole ratios to calculate the number of moles of product that can be formed from the limiting reactant.In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.to know more about limiting reaction follow
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what causes the lines in these spectra? why are the colors of the lines different? suggest a reason for the observation that the spectrum of calcium is more complicated than the spectrum of hydrogen.
Transitions of electrons within atoms or ions form spectral lines at different rungs which leads to emission of lines of different colors. Spectrum of calcium is more complicated than the spectrum of hydrogen because calcium atom have more electrons than hydrogen.
What are spectral lines?A spectral line in an otherwise smooth and continuous spectral is a dark or bright line resulting from the emission or absorption of light in a narrow frequency range compared to adjacent frequencies. Spectral lines are frequently used to identify atoms and molecules.
The spectral lines arise from electron transitions within an atom or ion. As electrons move toward or away from the nucleus (or ion) of an atom, they release or absorb energy in the form of light (or other radiation).Electrons fall on the lower rung and emit light with the energy of the rung difference. This allows different atoms to emit different colors of light.Calcium has a more complex spectrum. Because calcium has more electrons than hydrogen, there are more possible electronic states and transitions.To know more about spectral lines visit:
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mse 2001 compared to a semi-crystalline polymer of the same composition, a completely amorphous polymer is expected to:
The semi-crystalline polymer of the same composition, a completely amorphous polymer is expected to the crystallites scatter light.
Crystallization of polymers is a manner associated with the partial alignment of their molecular chains. these chains fold together and shape ordered areas called lamellae, which compose larger spheroidal systems named spherulites.
Semi-crystalline plastics can be taken into consideration for a selection of applications. choosing a plastic material for use in excessive temperature surroundings calls for a cautious assessment of fabric residence information. View our interactive Thermoplastics Triangle to evaluate substances.
Polyethylene is a partially crystalline solid whose residences are exceedingly dependent on the relative content of the crystalline section and amorphous section, i.e., crystallinity. Polyethylene is a polymer polymerized from monomeric ethylene.
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how many ml of 6.00 m hcl solution is needed to make 25.0 ml of 3.00 m hcl solution? answer in ml with correct significant figures and do not include units.
The answer is 12.5 mL.
Solution:
M, 6.00M V₁ =?
M2 = 3.00M, V₂ = 25.0mL
M1V1 = M2 V2/M1
V1 = M2V2 M,
V1 = 25.0X3.00/6.00
∴ V1 = 12.5 mL
The initial concentration of the resulting solution is 2 molar which is the volume multiplied by the concentration. The volume of the starting solution is therefore 2,500 ml × 2.25 mol. Calculate the number of moles of HCl dissolved in a given volume of acid by reacting an acid with CaCO3.
This is essentially a double exchange reaction with the decomposition of one of the products. To determine the amount of stock solution required divide the number of moles of glucose by the molarity of the stock solution.
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What would happen to the carbon dioxide and water if you decreased the amount of oxygen?
Answer:
What happens when carbon dioxide increases and oxygen decreases? Increasing carbon dioxide and decreasing oxygen make it harder for deep-sea animals to ‘breathe’ About one third of the carbon dioxide that humans produce by burning fossil fuels is being absorbed by the world’s oceans, gradually causing seawater to become more acidic.
Explanation:
Hope this helps
Which group is outside of our solar system
Answer:
Exoplanets
Explanation:
Exoplanets are planets beyond our own solar system. Thousands have been discovered in the past two decades, mostly with NASA's Kepler Space Telescope.
which formula(s) do you need to determine the ph that results from mixing 100 ml of 0.5 m hcl with 500 ml of 0.4 m nh3? think about all 8 steps and select all that apply.
HCl⟶H++Cl−
HI⟶H++I−
According to, the molarity of H+ is the same as HCl, because it is a strong acid and the mole ratio. So, I added the molarity of both acids: 0.15 M+0.055 M=0.205 M for H+ in solution.
pH= −log [H+]
pH= −log [0.205]
pH= 0.689
cHI(H+)=c(HI)cHCl(H+)=c(HCl)
Now you need to determine the amount of the protons in each solution with
n=c⋅V.
You have to add the amount of protons in each solution and determine the combined volume.
ntot(H+)=nHI(H+)+nHCl(H+)Vtot=V(HI)+V(HCl)
To calculate the pH of the resulting concentration, just take the negative logarithm.
pH=−logctot (H+) = −log[ntot (H+) Vtot]
pH is the negative logarithm of hydrogen ion concentration in a solution.
It determines the acidity and basicity of the solution.
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describe the experimental method through which you determine the appropriate wavelength for an analyte
Wavelength is chosen by analyzing the spectrogram.
Wavelength can be defined as the distance between two successive crests or troughs of a wave. It is measured in the direction of the wave.
A spectrogram gives a going for walks show of a sound signal because it takes place in real time, a spectrum, however, offers us a photograph of the sound at a particular factor in time. A spectrum can permit you to see.
Spectrograms map out sound in a comparable way to a musical rating, only mapping frequency rather than musical notes. Seeing frequency energy allotted over the years in this manner allows us to genuinely distinguish each of the sound factors in a recording, and their harmonic shape.
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4
How do you write 880% as a fraction, mixed number, or whole number?
Submit
Explanation:
a fraction 880/1000 or 22/25
mixed number 44/5
whole number 8
TRUE OR FALSE: As the reaction proceeds toward equilibrium, the concentrations of H2 and I2 gradually INcrease, while the concentration of HI gradually DEcreases
False. As the reaction proceeds toward equilibrium, the concentrations of [tex]H_2[/tex] and [tex]I_2[/tex] gradually decrease, while the concentration of HI gradually increases.
What is equilibrium in chemical reactions?In a chemical reaction, an equilibrium is reached when a reaction that proceeds in both ways has both forward and backward reactions at an equal rate.
For example, consider the reaction below:
A + B <---> C + D
At equilibrium, the rate of formation of A and B will be equal to the rate of formation of C and D.
Now, let us apply this to the reaction:
[tex]H_2 + I_2 < --- > 2HI[/tex]
Since the reactants are [tex]H_2[/tex] and [tex]I_2[/tex], initially, their concentrations will decrease while the concentration of the product, HI will increase. This will continue until the reaction reaches an equilibrium.
Thus, that the concentrations of [tex]H_2[/tex] and [tex]I_2[/tex] will gradually increase while the concentration of HI will gradually decrease as the reaction approaches an equilibrium is false.
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suppose you mix 100.0 g of water at 23.2 oc with 75.0 g of water at 71.9 oc. what will be the final temperature of the mixed water, in oc?
The final temperature of the mixed water is 17.43°C.
Principle of Calorimeter:
The body at a higher temperature releases heat while the body at a lower temperature absorbs heat. The principle of calorimetry indicates the law of conservation energy, i.e. the total heat lost by the hot body is equal to the total heat gained by the cold body.
From the calorimeter principle we have:
heat loss by hot water = Heat gained by the cold water
The formula for the heat gained or loss:
Q = m.c.ΔT
Q = heat gained or loss
c = specific heat
ΔT = temperature change
m1 = 100g
m2 = 75g
m2c ΔФ2 = m1c ΔФ1
75 × (71.6-T) = 100× ( T - 23.2)
5370 - 75T = 100T - 2320
175 T = 3050
T = 17.43°C
Therefore the final temperature is 17.43°C
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