Question 1

Which of the following could be added to a solution of NaF to prepare a buffer?

Accepted Answer

A) HBr 
B) NaOH 
C) LiC2H3O2 
D) KF 
E) NH3 
A) HBr 
B) NaOH 
C) LiC2H3O2 
D) KF 
E) NH3

Question 2

A solution containing which one of the following pairs of substances will be a buffer solution?

Accepted Answer

A) NaI, HI 
B) KBr, HBr 
C) RbCl, HCl 
D) CsF, HF 
E) none of the above 
A) NaI, HI 
B) KBr, HBr 
C) RbCl, HCl 
D) CsF, HF 
E) none of the above

Question 3

The pH of a solution prepared by dissolving 0.350 mol of acid in   of   of conjugate base is ________.The Kb for the conjugate base is   (Assume the final volume is 1.00 L.)

Accepted Answer

A) 11.23 
B) 1.66 
C) 11.14 
D) 2.77 
E) none of the above 
A) 11.23 
B) 1.66 
C) 11.14 
D) 2.77 
E) none of the above

Question 4

A solution is prepared by dissolving 0.23 mol of benzoic acid and 0.27 mol of sodium benzoate in water sufficient to yield 1.00 L of solution.The addition of 0.05 mol of NaOH to this buffer solution causes the pH to increase slightly.The pH does not increase drastically because the NaOH reacts with the ________ present in the buffer solution.The   of benzoic acid is 6.3 × 10-5.

Accepted Answer

A)    O 
B)    
C) benzoate 
D) benzoic acid 
E) This is a buffer solution: the pH does not change upon addition of acid or base. 
A)    O 
B)    
C) benzoate 
D) benzoic acid 
E) This is a buffer solution: the pH does not change upon addition of acid or base.

Question 5

A 25.0-mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution.What is the pH after 13.3 mL of base is added? The   of hypochlorous acid is 3.0 × 10-8.

Accepted Answer

A) 7.25 
B) 1.34 
C) 4.43 
D) 7.58 
E) 7.46 
A) 7.25 
B) 1.34 
C) 4.43 
D) 7.58 
E) 7.46

Question 6

A 50.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M NaOH solution.The titration curve above was obtained.The concentration of the monoprotic acid is about ________ mol/L.

Accepted Answer

A) 0.120 
B) 25.0 
C) 0.240 
D) 0.0600 
E) 0.100 
A) 0.120 
B) 25.0 
C) 0.240 
D) 0.0600 
E) 0.100

Question 7

The solubility of slightly soluble salts containing basic anions is directly proportional to the pH of the solution.

Accepted Answer

A) True 
 B)False

Question 8

A result of the common-ion effect is ________.

Accepted Answer

A) that some ions, such as Na+ (aq), frequently appear in solutions but do not participate in solubility equilibria 
B) that common ions, such as Na+ (aq), don't affect equilibrium constants 
C) that the selective precipitation of a metal ion, such as Ag+, is promoted by the addition of an appropriate counterion (X-)that produces a compound (AgX)with a very low solubility 
D) that ions such as K+ and Na+ are common ions, so that their values in equilibrium constant expressions are always 1.00 
E) that common ions precipitate all counter-ions 
A) that some ions, such as Na+ (aq), frequently appear in solutions but do not participate in solubility equilibria 
B) that common ions, such as Na+ (aq), don't affect equilibrium constants 
C) that the selective precipitation of a metal ion, such as Ag+, is promoted by the addition of an appropriate counterion (X-)that produces a compound (AgX)with a very low solubility 
D) that ions such as K+ and Na+ are common ions, so that their values in equilibrium constant expressions are always 1.00 
E) that common ions precipitate all counter-ions

Question 9

Calculate the pH of a solution that is 0.322 M in nitrous acid (   )and 0.178 M in potassium nitrite (KNO2).The acid dissociation constant of nitrous acid is 4.50 ×   .

Accepted Answer

A) 3.093 
B) 3.607 
C) 14.26 
D) 10.91 
E) 4.589 
A) 3.093 
B) 3.607 
C) 14.26 
D) 10.91 
E) 4.589

Question 10

Which one of the following is amphoteric?

Accepted Answer

A) H2SO4 
B) H2O2 
C) CO2 
D) H2O 
E) NaOH 
A) H2SO4 
B) H2O2 
C) CO2 
D) H2O 
E) NaOH

Question 11

In which of the following aqueous solutions would you expect AgF to have the highest solubility?

Accepted Answer

A) 0.00750 M LiF 
B) 0.030 M AgNO3 
C) 0.023 M NaF 
D) 0.015 M KF 
E) AgF will have the same solubility in all solutions. 
A) 0.00750 M LiF 
B) 0.030 M AgNO3 
C) 0.023 M NaF 
D) 0.015 M KF 
E) AgF will have the same solubility in all solutions.

Question 12

The addition of HCl and ________ to water produces a buffer solution.

Accepted Answer

A) HC6H5O 
B) C2H5NH2 
C) KOH 
D) KCl 
E) none of the above 
A) HC6H5O 
B) C2H5NH2 
C) KOH 
D) KCl 
E) none of the above

Question 13

Which compound listed below has the smallest molar solubility in water?

Accepted Answer

A) ZnCO3 
B) Cd(OH)2 
C) CdCO3 
D) AgI 
E) CaF2 
A) ZnCO3 
B) Cd(OH)2 
C) CdCO3 
D) AgI 
E) CaF2

Question 14

Which solution has the greatest buffering capacity?

Accepted Answer

A) 0.335M HC2H3O2 and 0.497 M NaC2H3O2 
B) 0.520 M HC2H3O2 and 0.116 M NaC2H3O2 
C) 0.820 M HC2H3O2 and 0.715 M NaC2H3O2 
D) 0.120 M HC2H3O2 and 0.115 M NaC2H3O2 
A) 0.335M HC2H3O2 and 0.497 M NaC2H3O2 
B) 0.520 M HC2H3O2 and 0.116 M NaC2H3O2 
C) 0.820 M HC2H3O2 and 0.715 M NaC2H3O2 
D) 0.120 M HC2H3O2 and 0.115 M NaC2H3O2

Question 15

The concentration of iodide ions in a saturated solution of silver iodide is ________ M.The solubility product constant of AgI is

Accepted Answer

A) 3.8 × 10-11 
B) 3.0 × 10-10 
C) 9.1 × 10-9 
D) 3.5 × 10-9 
E) 1.4 × 10-8 
A) 3.8 × 10-11 
B) 3.0 × 10-10 
C) 9.1 × 10-9 
D) 3.5 × 10-9 
E) 1.4 × 10-8

Question 16

The   of some weak acid HA is 1.76 ×   .The pH of a buffer prepared by combining 15.0 mL of   A- and 50.0 mL of 1.00 M HA is ________.

Accepted Answer

A) 1.705 
B) 4.232 
C) 0.851 
D) 2.383 
E) 3.406 
A) 1.705 
B) 4.232 
C) 0.851 
D) 2.383 
E) 3.406

Question 17

What is the molar solubility of calcium carbonate ( CaCO3 )in water? The solubility-product constant for CaCO3 is 4.5 × 10-9 at 25 °C.

Accepted Answer

A) 2.3 × 10-9 
B) 9.0 × 10-9 
C) 8.35 
D) 9.5 × 10-5 
E) 6.7 × 10-5 
A) 2.3 × 10-9 
B) 9.0 × 10-9 
C) 8.35 
D) 9.5 × 10-5 
E) 6.7 × 10-5

Question 18

0.78 M Na       and   are required to prepare a buffer solution with a pH of 4.40 .The   of H       is

Accepted Answer

A) 3.5 
B) 4.1 × 104 
C) 1.7 
D) 0.86 
E) 0.35 
A) 3.5 
B) 4.1 × 104 
C) 1.7 
D) 0.86 
E) 0.35

Question 19

The addition of HCl and ________ to water produces a buffer solution.

Accepted Answer

A) NH3 
B) HC6H5O 
C) KOH 
D) KNO3 
E) HNO3 
A) NH3 
B) HC6H5O 
C) KOH 
D) KNO3 
E) HNO3

Question 20

In which aqueous system is   least soluble?

Accepted Answer

A)    O 
B) 0.5 M HF 
C) 0.2 M HF 
D) 1.0 M HN   
E) 0.8 M KF 
A)    O 
B) 0.5 M HF 
C) 0.2 M HF 
D) 1.0 M HN   
E) 0.8 M KF

Exam 17: Additional Aspects of Aqueous Equilibria

Which of the following could be added to a solution of NaF to prepare a buffer?

A solution containing which one of the following pairs of substances will be a buffer solution?

The pH of a solution prepared by dissolving 0.350 mol of acid in of of conjugate base is ________.The Kb for the conjugate base is (Assume the final volume is 1.00 L.)

A 25.0-mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution.What is the pH after 13.3 mL of base is added? The of hypochlorous acid is 3.0 × 10-8.

A 50.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M NaOH solution.The titration curve above was obtained.The concentration of the monoprotic acid is about ________ mol/L.

The solubility of slightly soluble salts containing basic anions is directly proportional to the pH of the solution.

A result of the common-ion effect is ________.

Calculate the pH of a solution that is 0.322 M in nitrous acid ( )and 0.178 M in potassium nitrite (KNO2).The acid dissociation constant of nitrous acid is 4.50 × .

Which one of the following is amphoteric?

In which of the following aqueous solutions would you expect AgF to have the highest solubility?

The addition of HCl and ________ to water produces a buffer solution.

Which compound listed below has the smallest molar solubility in water?

Which solution has the greatest buffering capacity?

The concentration of iodide ions in a saturated solution of silver iodide is ________ M.The solubility product constant of AgI is

The of some weak acid HA is 1.76 × .The pH of a buffer prepared by combining 15.0 mL of A- and 50.0 mL of 1.00 M HA is ________.

What is the molar solubility of calcium carbonate ( CaCO3 )in water? The solubility-product constant for CaCO3 is 4.5 × 10-9 at 25 °C.

0.78 M Na and are required to prepare a buffer solution with a pH of 4.40 .The of H is

The addition of HCl and ________ to water produces a buffer solution.

In which aqueous system is least soluble?

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

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The pH of a solution prepared by dissolving 0.350 mol of acid in of of conjugate base is ________.The K_b for the conjugate base is (Assume the final volume is 1.00 L.)

A 25.0-mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution.What is the pH after 13.3 mL of base is added? The of hypochlorous acid is 3.0 × 10^-8.

Calculate the pH of a solution that is 0.322 M in nitrous acid ( )and 0.178 M in potassium nitrite (KNO₂).The acid dissociation constant of nitrous acid is 4.50 × .

The of some weak acid HA is 1.76 × .The pH of a buffer prepared by combining 15.0 mL of A^- and 50.0 mL of 1.00 M HA is ________.

What is the molar solubility of calcium carbonate ( CaCO₃ )in water? The solubility-product constant for CaCO₃ is 4.5 × 10^-9 at 25 °C.