Question 1

Which one of the following pairs cannot be mixed together to form a buffer solution?

Accepted Answer

A) C5H5N, C5H5NHCl 
B) HC2H3O2, NaOH (C2H3O2- = acetate) 
C) KOH, HI 
D) NH2CH3, HCl 
E) NaClO, HNO3 
A) C5H5N, C5H5NHCl 
B) HC2H3O2, NaOH (C2H3O2- = acetate) 
C) KOH, HI 
D) NH2CH3, HCl 
E) NaClO, HNO3

Question 2

The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is ________.

Accepted Answer

A) 1.314 
B) 1.403 
C) 0.00824 
D) 12.597 
E) 12.923 
A) 1.314 
B) 1.403 
C) 0.00824 
D) 12.597 
E) 12.923

Question 3

In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.

Accepted Answer

A) the system is not at equilibrium 
B) the buffering capacity is significantly decreased 
C) the -log of the [H+] and the -log of the Ka are equal 
D) All of the above are true. 
A) the system is not at equilibrium 
B) the buffering capacity is significantly decreased 
C) the -log of the [H+] and the -log of the Ka are equal 
D) All of the above are true.

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

Accepted Answer

A) The concentration of hydronium ions will increase significantly. 
B) The concentration of fluoride ions will increase as will the concentration of hydronium ions. 
C) The concentration of hydrogen fluoride will decrease and the concentration of fluoride ions will increase. 
D) The concentration of fluoride ion will decrease and the concentration of hydrogen fluoride will increase. 
E) The fluoride ions will precipitate out of solution as its acid salt. 
A) The concentration of hydronium ions will increase significantly. 
B) The concentration of fluoride ions will increase as will the concentration of hydronium ions. 
C) The concentration of hydrogen fluoride will decrease and the concentration of fluoride ions will increase. 
D) The concentration of fluoride ion will decrease and the concentration of hydrogen fluoride will increase. 
E) The fluoride ions will precipitate out of solution as its acid salt.

Question 6

The concentration of iodide ions in a saturated solution of lead (II)iodide is ________ M. The solubility product constant of PbI2 is 1.4 × 10-8.

Accepted Answer

A) 3.8 × 10-4 
B) 3.0 × 10-3 
C) 1.5 × 10-3 
D) 3.5 × 10-9 
E) 1.4 × 10-8 
A) 3.8 × 10-4 
B) 3.0 × 10-3 
C) 1.5 × 10-3 
D) 3.5 × 10-9 
E) 1.4 × 10-8

Question 7

A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The Ka of hydrazoic acid is 1.9 × 10-5.

Accepted Answer

A) 2.54 
B) 11.47 
C) 7.00 
D) 4.70 
E) 4.74 
A) 2.54 
B) 11.47 
C) 7.00 
D) 4.70 
E) 4.74

Question 8

Of the substances below, ________ will decrease the solubility of Pb(CN)2 in a saturated solution.

Accepted Answer

A) Pb(MnO4)2 
B) NaMnO4 
C) HMnO4 
D) H2O2 
E) NaCl 
A) Pb(MnO4)2 
B) NaMnO4 
C) HMnO4 
D) H2O2 
E) NaCl

Question 9

The molar solubility of ________ is not affected by the pH of the solution.

Accepted Answer

A) Na3PO4 
B) NaF 
C) KNO3 
D) AlCl3 
E) MnS 
A) Na3PO4 
B) NaF 
C) KNO3 
D) AlCl3 
E) MnS

Question 10

The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH)2 and 150.0 mL of 0.125 M HCl is ________.

Accepted Answer

A) 6.29 
B) 4.11 
C) 1.14 
D) 5.78 
E) 1.34 
A) 6.29 
B) 4.11 
C) 1.14 
D) 5.78 
E) 1.34

Question 11

The Ka of acetic acid is 1.76 × 10-5. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

Accepted Answer

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

Question 12

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 13

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

Accepted Answer

A) 0.030 M LiF 
B) pure water 
C) 0.023 M NaF 
D) 0.015 M KF 
E) 0.0075 M AgNO3 
A) 0.030 M LiF 
B) pure water 
C) 0.023 M NaF 
D) 0.015 M KF 
E) 0.0075 M AgNO3

Question 14

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

Accepted Answer

A) HCl 
B) NaNO3 
C) NaCl 
D) NaOH 
E) NaBr 
A) HCl 
B) NaNO3 
C) NaCl 
D) NaOH 
E) NaBr

Question 15

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC2H3O2 is ________.

Accepted Answer

A) 9.97 
B) 7.74 
C) 0.878 
D) 13.122 
E) none of the above 
A) 9.97 
B) 7.74 
C) 0.878 
D) 13.122 
E) none of the above

Question 16

For any buffer system, the buffer capacity depends on the amount of acid and base from which the buffer is made.

Accepted Answer

A) True 
 B)False

Which one of the following pairs cannot be mixed together to form a buffer solution?

The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is ________.

In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.

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

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

The concentration of iodide ions in a saturated solution of lead (II)iodide is ________ M. The solubility product constant of PbI₂ is 1.4 × 10^-8.

A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The K_a of hydrazoic acid is 1.9 × 10^-5.

Of the substances below, ________ will decrease the solubility of Pb(CN)₂ in a saturated solution.

The molar solubility of ________ is not affected by the pH of the solution.

The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH)₂ and 150.0 mL of 0.125 M HCl is ________.

The K_a of acetic acid is 1.76 × 10^-⁵. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

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

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

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

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC₂H₃O₂ is ________.

For any buffer system, the buffer capacity depends on the amount of acid and base from which the buffer is made.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

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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Exam 17: Additional Aspects of Aqueous Equilibria

Which one of the following pairs cannot be mixed together to form a buffer solution?

The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is ________.

In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.

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

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

The concentration of iodide ions in a saturated solution of lead (II)iodide is ________ M. The solubility product constant of PbI2 is 1.4 × 10-8.

A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The Ka of hydrazoic acid is 1.9 × 10-5.

Of the substances below, ________ will decrease the solubility of Pb(CN)2 in a saturated solution.

The molar solubility of ________ is not affected by the pH of the solution.

The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH)2 and 150.0 mL of 0.125 M HCl is ________.

The Ka of acetic acid is 1.76 × 10-5. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

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

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

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

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC2H3O2 is ________.

For any buffer system, the buffer capacity depends on the amount of acid and base from which the buffer is made.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

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

Filters

The concentration of iodide ions in a saturated solution of lead (II)iodide is ________ M. The solubility product constant of PbI₂ is 1.4 × 10^-8.

A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The K_a of hydrazoic acid is 1.9 × 10^-5.

Of the substances below, ________ will decrease the solubility of Pb(CN)₂ in a saturated solution.

The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH)₂ and 150.0 mL of 0.125 M HCl is ________.

The K_a of acetic acid is 1.76 × 10^-⁵. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC₂H₃O₂ is ________.