the titration of a polyprotic acid with sufficiently different pka 's displays two equivalence points. why?

Answers

Answer 1

If Ka1 and Ka2 are sufficiently distinct and a polyprotic acid is titrated with a strong base, the pH curve will contain two equivalence points because the two acidic protons will be titrated sequentially.

What is titration?

Titration is a method of chemical analysis in which the amount of a sample's constituents is determined by adding a precise amount of a different substance—one that the desired constituent reacts with in a specific, known proportion—to the sample being tested.

The titrating reagent, or titrant, is gradually added to the process using a standard solution (i.e., a solution of known concentration), which is administered using a burette, which is essentially a long, graduated measurement tube with a stopcock and a delivery tube at its bottom end. The addition comes to an end at the comparable point.

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Related Questions

(Digestion, Intestine, Bile)is secreted by the liver to help in the breaking down of food particles.​

Answers

Answer:

Bile

Explanation:

Bile is secreted by the liver to help in the breaking down of food particles.​

Ionic bonds have all of the following properties, except ___.


soluable (ability to dissolve) in water


strong crystalline solids


generally white in color


when dissolved are electrically conductive

Answers

Generally white in color


Balance the chemical equation for the
conversion of titanium dioxide to titanium chloride.
TiO₂ + Cl₂ + C → TICI + CO₂

Answers

Answer:

Explanation:

Here, we see that on the left-hand side the elements are as such -

TI - 1

O - 2

Cl - 2

C - 1

On the right-hand side, we have -

TI - 1

Cl - 1

C - 1

O - 2

So, this is how they will be balanced out -

2TIO₂ + Cl₂ + 2C => 2TICl + 2CO₂

in a mixture of an alcohol and ketone of equal molecular weight, which will have the larger rf value and why?

Answers

The ketone will have a larger rf value because it is more polar than the alcohol.

Does more polarity suggest a greater or lesser Rf value?

Calculating the Rf value is possible if you can see the spots.The identity and properties of the various compounds can be established using the Rf values.Since more polar compounds have a stronger affinity for the polar solid phase, they will have smaller Rf values.Rf values are typically higher for low-polarity chemicals compared to higher-polarity ones. Generally speaking, as the polarity of a compound increases, so does its absorptivity (i.e., the more polar the compound, the stronger it binds to the adsorbent).

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5. What are the coefficients when the equation below is balanced?
_H₂+_0₂→--H₂O

O 1,1,2
O 4,3,1
O 2,1,2
0 2,2,1

Answers

Answer:

C.) 2,1,2

Explanation:

You have to balance the equation by getting the number of elements on the left and right side to equal. Before balancing there is one more oxygen on the left side than the right side. You have to change the coefficient in front of H2O to fix this, and that means adding a "2" in front of the H2 to get that to equal as well.

You end up with 2H₂+10₂→ 2H₂O

if the bromobenzene is added too quickly, what side product is formed (draw the structure in pen and name it!)?

Answers

If the bromobenzene is added too quickly, biphenyl is formed as the side product with the Grignard reagent.

What is Grignard reagent?

Grignard reagent is an organomagnesium halide which has the formula RMgX where R is alkyl or aryl group, Mg is magnesium, X is an halide.

When bromobenzene is added too quickly to the Grignard reagent, biphenyl is formed as a by-product. the formation of the side product is enhanced by high temperature. So, this reaction is carried out in low temperature.

Therefore, biphenyl is formed as side product when bromobenzene is added quickly to the Grignard reagent. The structure of biphenyl is two benzene rings joined together.

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if you were asked to design a metal support bracket for a shelf, which of the strengths studied in this lab would you use to determine the design strength? why might you use a safety factor? explain your reasoning.

Answers

The safety factor describes how much more robust a system is than is necessary for the load that is intended.

The shape, dimensions, and holes of a metal support bracket determine its strength. Static loading, bracket material Designing a metal support bracket that is strong depends on the metal's thickness and profile. Thus, strength is determined by shape, size, and holes. The bracket's material not only determines its strength, but it also has the ability to withstand rusting. Static loading examines the amount of load the bracket can support before deflection to evaluate the strength. utilising the safety factor .

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The type of radioactive decay that releases only energy in order to become stable is
A. gamma decay
B.beta decay
C.electronic decay.
D. alpha decay.

Answers

Answer: B Is the answer

Explanation:  I just did this

Calculate the AG° at 298 K for the following reaction. Show your work.
Fe₂O3(s) + 13CO(g) → 2Fe(CO),(g) + 3CO₂(g)
-824.2 -110.5
-733.8
-393.5
AH (kJ/mol)
87.4 197.6
AS (J/mol K)
445.2
213.6

Answers

The ΔG at 298K of the given reaction is -304.08kJ/mole.

Combustion is a high-temperature exothermic redox chemical reaction between a fuel and oxygen oxides. Photosynthesis is an example of an involuntary reaction. Plants absorb water and carbon dioxide. But for it to change, it needs sunlight. This is an involuntary reaction.

calculation:-

ΔG  = ΔH -TΔS

Hence,

= (-733.8-393.5+824.2+110.5) - 298*(445.5+213.6-87.4-197.6)/1000

= -304.08kJ/mole

A spontaneous reaction is one that promotes the formation of products under the conditions under which the reaction occurs. A roaring campfire is an example of a natural reaction because it is exothermic. Processes that are spontaneous in one direction under certain conditions are not spontaneous in the reverse direction. For example, at room temperature and normal atmospheric pressure ice naturally melts but water does not naturally freeze.

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an indium (in) atom has 49 electrons. electrons in which subshell of the indium atom ground state experience the lowest effective nuclear charge (z* or zeff)?

Answers

5p subshell of the indium atom ground state experience the lowest effective nuclear charge (Z or Zeff)

Atomic number of indium = 49

E.C of indium = [Kr]4d¹⁰5S²5p¹

The outer 3 electrons indicate that indium is a 3rd group element

In the ground state, the outer electrons of In are present in the 5s and 5p orbitals

So among 5s and 5p which will experience the lowest nuclear charge (Zeff)

The nuclear charge depends on the shape of the orbital

5s has spherical shape while 5p has DB shape

Among the spherical and DB shape, the second one experiences the lower nuclear charge.

So the answer is 5p subshell of the indium will experience the lowest effective nuclear charge (Z or Zeff)

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5. describe a process in which 2 substances that are mixed together can be separated from each other. would this be a physical change or a chemical change? provide an explanation for your answer.

Answers

When two compounds are combined and change into a third substance, this is referred to as a biochemical reaction (or chemical reaction). When two substances are combined, not all of them react chemically.

How does chemical change?

When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that molecules and atoms are ordered, which leads to the formation of new substances with new properties.

Describe a chemical example:

Examples for chemicals include the basic building blocks, such as zinc, nitrogen, and oxygen; combinations created from these building blocks, such as water, dioxide, or salt; and more complicated substances, such as the air you breathe, rainfall, a chicken, a car, etc.

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how many grams of silver chromate will precipitate when 150 ml of .500 m silver nitrate is added to 100 ml of .400 potassium chromate

Answers

There is 12.4g of silver chromate.

Almost all alkali metal compounds and nitrates are soluble, but most silver compounds are not. Therefore, when the soluble salts silver nitrate and sodium chromate are mixed, insoluble silver chromate is formed and precipitated. This method involves titrating the chloride ion concentration in a solution with silver nitrate. A silver chloride precipitate forms when the silver nitrate solution is slowly added.

The endpoint of the titration is when all chloride ions have precipitated. Silver chromate precipitates as a brick-red precipitate from aqueous solutions. This reaction is also called a precipitation reaction. A precipitate is an insoluble solid that forms when solutions are mixed. For precipitation titrations with silver nitrate, a suitable indicator indicates the end point of the titration by a color change when there is excess Ag+ in the solution.

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Five waves measure 25 cm and pass a point in 1 s. What is:
the wavelength
the frequency
the period?

Answers

Five waves measure 25 cm and pass a point in 1 s then the wavelength is 5cm the frequency is 5Hz and the period is 5 s

Wavelength is the distance between identical point in the adjacent cycle of a waveform signal propagated in space or along a wireFrequency is the number of waves that pass a fixed point in unit timeThis means the period of a wave is the inverse of the frequency so the formula for wave period is wavelength divided by velocity

Here given data is

Five waves measure 25 cm and pass a point in 1 s

So, the wavelength = λ = v/f

Wavelength =  25 cm/5 waves

Wavelength = 5cm

Frequency = 1/T

Frequency = 1/5 = 5Hz

Period = 1/frequency

Period = 1/5 = 5 s

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g if a hand cream appears smooth and uniform after you prepared it, but after a week of storage most of the water and most of the oil separated, what do you think must have gone wrong with the preparation?

Answers

Because of Emulsion, when we store hand cream for a week its oil and water get separated.

Water and oil are necessary to make hand cream. water is an emulsifying agent.oil and water mixtures are emulsions when shaken together.The oil will form droplets and dispersed throughout the water.In this process,the most necessary is to mix the oil and water properly.The content of the ingredients may have been miscalculated or the temperature of the water is not enough.

Emulsifiers are added to hand cream.This is based on chemicals phospholipids.These are obtained from plants,nuts,berries ,leafs etc.

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the following metal specimen was tensile tested until failure. which type of metal would experience this type of failure?

Answers

brittle metal would experience this type of failure

Glass, ceramic, graphite, and some alloys with very low plasticity are examples of brittle materials. In these materials, cracks can start without plastic deformation and quickly progress to brittle breakage. It is a steel-gray, lightweight metal called beryllium. It is also highly brittle, which means that it fractures easily when under stress but does not typically distort before it does so (similar to glass or ceramic). Beryllium is a naturally occurring element found in over 100 different minerals and has a wide range of modern-day applications. Cast iron has a rough feel and is more brittle because it includes 2% to 3.5% carbon. Despite being made of alloyed metals, carbon steel lacks other alloying components, hence despite being an alloy, it is not classified as an alloy.

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hydrochloric acid reacts with many metals to form hydrogen gas and the corresponding metal chloride. if you needed to produce hydrogen gas as a source of fuel, and given a choice of na, mg, al, or zn as the metal, which one would you choose to maximize the amount of hydrogen gas produced per gram of metal?

Answers

Magnesium would be chosen to produce the hydrogen gas .

What is Chemical reaction ?

There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.

Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.

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which is the best reason that the atomic radius generally increases with atomic number in each group of elements?

Answers

The atomic radius becomes larger as move down the group or column in the periodic table because it increases the number of energy levels with each successive period.

As we move down the group, the number of period increases, which means the number of shells in an atom also increases. So, the extra electrons are added in the next shell with each successive period down the group, and the atomic size increases with an increase in atomic number down the group.

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calculate the theoretical yield of all products when 18.9 grams of lithium phosphate reacts with excess gold (i) acetate

Answers

The yield of products formed is:

gold phosphate equals 111.93 grams and the yield of lithium acetate 32.30 grams.

This theoretical yield can be calculated as:

Molar masses of reactants and products that they need. lithium phosphate equals 115.79 grams per mole. Mass of gold phosphate equals 685.87 grams per mole and the molar mass of lithium acetate equals 65.98 grams per mole. Using number of moles and mass of substance produced we can calculate the products formed.

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14.55ml of 0.3674 m naoh was required to neutralize 25.00 ml of hcl with an unknown concentration. what was the concentration of the hcl solution in the units of mol/l?

Answers

14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration.  the concentration of the HCl solution in the units of mol/l  is 0.212 mol / L.

given that :

volume V1 = 14.55 mL = 0.0145 L

Molarity M1 = 0.3674 M

Volume V2 = 25 mL = 0.025 L

molarity M2 = ?

using the formula for dilution , we get ;

M1 V1 = M2 V2

0.3674 × 0.0145 = M2 × 0.025

M2 = 0.0053 / 0.025

M2 = 0.212 M = 0.212 mol / L

Thus, 14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration.  the concentration of the HCl solution in the units of mol/l  is 0.212 mol / L.

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Which model is useful in showing the reactivity of potassium?
Neither model is able to show the reactivity of potassium.
Model 1 because it shows an electron in the 4s orbital.
Model 2 because it shows an electron in the outermost ring.
Both models because each shows an electron in the outermost shell.

Answers

Both models are useful to describe the reactvity of potassium because each shows an electron in the outermost shell.

What are the valence electrons?

Valence electrons can be described as the s and p electrons in the outermost shell while the electrons present in the inner shell are called core electrons.

Valence electrons can be all arranged in different shells and are negatively charged particles. These electrons are responsible for chemical interaction between atoms and the formation of chemical bonds.

Only the electrons present in the outermost shell can contribute in the formation of a chemical bond and decide the reactvity of atom such type of electrons is called valence electrons.

The reactivity in potassium can be seen due to one electron present in the valence shell.

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How can you describe carbohydrates

Answers

Carbohydrates are known as which are proteins and fats in an animal or a human

what is the empirical formula of a compound that contains 60% titanium and 40% oxygen by mass?

Answers

The empirical formula of a compound that contains 60% titanium and 40% oxygen by mass is TiO₂.

How to calculate empirical formula?

Empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.

The empirical formula of a substance can be calculated as follows:

Ti = 60g ÷ 47.87g/mol = 1.25molO = 40g ÷ 16g/mol = 2.5mol

Next, we divide each mole value by the smallest as follows:

Ti = 1.25mol ÷ 1.25 = 1O = 2.5mol ÷ 1.25 = 2

The empirical ratio of Titanium and oxygen is 1:2, hence, the empirical formula is TiO₂.

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How many electrons are located in the outermost orbit in the bohr model of a boron atom?.

Answers

The number electrons in the outermost orbit in the Bohr model of a Boron atom is 3. The outermost orbit of the electrons of a Boron atom is in the L-shell.

What is Bohr model?

The Bohr model is a structural model of an atom where the electrons revolve around the nucleus of an atom in distinct circular orbits (shells). Each shell has a maximum number of electrons by this formula: 2n², where n is the principal quantum numbers (n = 1, 2, 3, 4, ...).

The 1st orbit called K-shell has the maximum electrons 2(1)² = 2.The 2nd orbit called L-shell has the maximum electrons 2(2)² = 8.The 3rd orbit called M-shell has the maximum electrons 2(3)² = 18.The 4th orbit called N-shell has the maximum electrons 2(4)² = 32.The 5th orbit called O-shell has the maximum electrons 2(5)² = 50.

The composition of numbers of electrons in each shell of an atom is called electronic configuration.

Boron is an atom with the atomic number 5. So, it has 5 electrons. The electronic configuration is

K-shell = 2 electronsL-shell = 3 electrons

L-shell is the outermost orbit in the Bohr model of a Boron atom.

Hence, the number of electrons in the outermost orbit in the Bohr model of a Boron atom is 3.

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Which of the following are spectator ions in the equation below? Select all that apply
Pb(C₂H302)2(ag) + 2 LiCl(ag) 2 LIC₂H302(ag) + PbCl2(s)

Pb2+(aq)
Li+(aq)
Cl-(aq)
C2H3O-2(aq)

I hope i entered the answer options right

Answers

Li (aq) and C2H3O2 (aq) because after the reaction has happened they still are in the same state, aq. While Pb and Cl has turned from aq to solid.

a gas mixture of xe, ne, and ar has a total pressure of 12.20 atm. what is the mole fraction of xe if the partial pressures of ne and ar are 2.10 and 4.50 atm, respectively?

Answers

6.6  is the mole fraction of xe if the partial pressures of ne and ar are 2.10 and 4.50 atm, respectively.

Why is partial pressure called?

The idea of partial pressure is driven by the fact that each individual gas contributes to the overall pressure in a given proportion, which corresponds to its partial pressure. In order to characterize all the pieces, it is essentially equivalent to taking a % or proportion of the whole.

Briefing:

The total pressure is equal to the sum of the individual pressures, according to Dalton's law.

Ptotal = total pressure of gases = 12.20 atm

Pne = partial pressure of ne = 2.10 atm

Par = partial pressure of ar = 4.50 atm

Pxe = partial pressure of xe = ?

putting in the values we get:

12.20 = 2.10 + 4.50 + Pxe

Pxe = 5.6

We employ Dalton's law to determine the solution's vapor pressure, which is:

Ptotal = (Pxe + Xxe)

We are given:

Pxe = partial pressure of xenon = 5.6

Xxe = mole fraction of xenon = ?

Using the values in the aforementioned equation, we get:

12.20 = (5.60 * Xxe)

Xxe = 6.6

The mole fraction of Xe is 6.6 as a result.

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two absorption peaks located near 255 nm are separated by 0.03 nm. what minimum resolution must a grating have in order to separate these wavelengths?

Answers

The minimum resolution to separate these wavelengths is 250nm as they are located near 255n and 0.03nm.

Resolution also known as optical resolution or chiral resolution, or chiral activity refers to the activeness of the compound. It is the process in which two racemic mixtures are separated into its components.

    Wavelength is known as the distance between two repeated waves of light. Wavelength is denoted by the symbol lambda (λ). It gives us the idea of the speed or pace of a particular light.

    In the given condition, two absorption peaks - absorption spectroscopy is the absorption spectrum between which the light releases protons. Therefore, the wavelength to separate these two absorption peaks is 250nm in minimum.

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what is the main safety hazard of tmscl in this lab, and what precautions should you take when handling tmscl?

Answers

The main safety hazards of trimethylsilyl chloride (tmscl)  in the lab are,

It could cause severe eye burns.

It is harmful if absorbed through the skin. It could cause severe burns.

It may be harmful if swallowed. Causes severe digestive tract burns.

It may be harmful if inhaled. Causes chemical burns to the respiratory tract.

Prolonged or repeated skin contact may cause dermatitis.

Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.

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gas of unknown molecular mass was allowed to effuse through a small opening under constant pressure conditions. it required 57 s for 1.0 l of the gas to effuse. under identical experimental conditions it required 26 s for 1.0 l of o2 gas to effuse. calculate the molar mass of the unknown gas.

Answers

The molar mass of the other gas is 153.79 g/mol

Step 1: The Data given,

It required 57 s for 1.0 L of the gas to effuse.

Under identical experimental conditions it required 26 s for 1.0 L of O2 gas to effuse.

Step 2: Calculate the molar mass

Graham's law of effusion says:

r1/r2 = √(M2/M1)

⇒ with r1 = effusion rate 1 = L/57s

⇒ with r2 = effusion rate 2 = L/26s

⇒ with M1 = molar mass of the gas = x g/mol

⇒ with M2 = molar mass of oxygen = 32 g/mol

We should be careful if we plug in the effusion rate. Because the fractions could flip if we don't give the effusion rates as numeral values.

(L/57s)/(L/26s) = 26/57 = √(32/M1)

26/57 =√(32/X)

(26/57) ² = 32/X

0.208064 =32/X

X = 32/0.208064

X = 153.79 g/mol

Hence, The molar mass of the other gas is 153.79 g/mol

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Which best explains how the chemical reaction shown below follows the law of conservation of mass? 2H2 + O2 → 2H2O

Answers

The given equation is showing the law of conservation of mass as the number of hydrogen and oxygen atoms are same on the both sides of the equation.

What is the chemical equation?

A chemical equation can be described as the representation of a  reaction in terms of chemical symbols of the substances. A chemical equation possesses of participating reactants in the reaction, formed products, and an arrow representing the direction of the chemical reaction.

The chemical equation in which the number of atoms of each element is equal on either side of the equation is called a balanced chemical equation.

The law of conservation of mass obeys by every balanced chemical equation. By following law of conservation, the total mass of the chemical elements  on the reactant side should be equal to the total mass of chemical elements on the product side in a balanced chemical equation.

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stion 1 of 10
What does a pH of 7 say about a solution?
O A. The solution is neutral.
B. The solution is at equilibrium.
OC. The solution is acidic.
O D. The solution is basic.

Answers

The correct answer is A. A pH of 7 say about a solution is The solution is neutral.

What is a pH of 7

A pH of 7 indicates a neutral solution. The pH scale is a logarithmic scale that measures the acidity or alkalinity (basicity) of a solution. A pH value of 7 is considered neutral, which means the concentration of hydrogen ions (H+) is equal to the concentration of hydroxide ions (OH-) in the solution. In other words, the solution is neither acidic nor basic.

Acidic solutions have a higher concentration of hydrogen ions (H+), which makes them more acidic. The lower the pH value, the higher the concentration of H+ ions and the stronger the acid.

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