Question 1

An acid containing the COOH group is called a carbo-oxy acid.

Accepted Answer

A) True 
 B)False  False

Question 2

A solution of formic acid is 3.0% dissociated at 25.0°C. What is the original concentration (in M)of the formic acid solution? The Ka at 25.0 °C for formic acid is 1.8 × 10-4.

Accepted Answer

0.20

Question 3

In the gas phase reaction below, NH3 is acting as a(n)__________ base but not as a(n)__________ base. H+
. . |
N + H+ → N
| |
H H H H H H

Accepted Answer

A) Arrhenius, BrØnsted-Lowry 
B) BrØnsted-Lowry, Lewis 
C) Lewis, Arrhenius 
D) Lewis, BrØnsted-Lowry 
E) Arrhenius, Lewis 
A) Arrhenius, BrØnsted-Lowry 
B) BrØnsted-Lowry, Lewis 
C) Lewis, Arrhenius 
D) Lewis, BrØnsted-Lowry 
E) Arrhenius, Lewis C

Question 4

Calculate the pH of 0.586 M anilinium hydrochloride (C6H5NH3Cl)solution in water, given that Kb for aniline is 3.83 × 10-4.

Accepted Answer

A) 1.82 
B) 12.18 
C) 5.41 
D) 8.59 
E) 12.42 
A) 1.82 
B) 12.18 
C) 5.41 
D) 8.59 
E) 12.42

Question 5

Classify the following compounds as weak bases (W)or strong bases (S): ammonia fluoride ion sodium hydroxide

Accepted Answer

A) W W S 
B) S S S 
C) S W W 
D) W S S 
E) W S W 
A) W W S 
B) S S S 
C) S W W 
D) W S S 
E) W S W

Question 6

Using the data in the table, which of the conjugate acids below is the weakest acid?

Accepted Answer

A) HClO 
B) HCO3- 
C) H2S 
D) NH3CH3+ 
E) H2S and HClO 
A) HClO 
B) HCO3- 
C) H2S 
D) NH3CH3+ 
E) H2S and HClO

Question 7

Ka for HCN is 4.9 × 10-10. What is the pH of a 0.068 M aqueous solution of sodium cyanide?

Accepted Answer

A) 0.74 
B) 2.96 
C) 11.07 
D) 13.24 
E) 7.00 
A) 0.74 
B) 2.96 
C) 11.07 
D) 13.24 
E) 7.00

Question 8

Classify the following compounds as weak acids (W)or strong acids (S): nitrous acid hydrochloric acid hydrofluoric acid

Accepted Answer

A) W W W 
B) S S S 
C) S W W 
D) W S S 
E) W S W 
A) W W W 
B) S S S 
C) S W W 
D) W S S 
E) W S W

Question 9

Which of the following ions will act as a weak base in water?

Accepted Answer

A) OH- 
B) Cl- 
C) NO3- 
D) ClO- 
E) None of the above will act as a weak base in water. 
A) OH- 
B) Cl- 
C) NO3- 
D) ClO- 
E) None of the above will act as a weak base in water.

Question 10

Kb for NH3 is 1.8 × 10-5. What is the pOH of a 0.15 M aqueous solution of NH4Cl at 25.0 °C?

Accepted Answer

A) 2.78 
B) 11.22 
C) 8.96 
D) 5.04 
E) 11.23 
A) 2.78 
B) 11.22 
C) 8.96 
D) 5.04 
E) 11.23

Question 11

In which of the following aqueous solutions does the weak acid exhibit the lowest percentage ionization?

Accepted Answer

A) 0.01 M HC2H3O2 (Ka = 1.8 × 10-5) 
B) 0.01 M HNO2 (Ka = 4.5 × 10-4) 
C) 0.01 M HF (Ka = 6.8 × 10-4) 
D) 0.01 M HClO (Ka = 3.0 × 10-8) 
E) These will all exhibit the same percentage ionization. 
A) 0.01 M HC2H3O2 (Ka = 1.8 × 10-5) 
B) 0.01 M HNO2 (Ka = 4.5 × 10-4) 
C) 0.01 M HF (Ka = 6.8 × 10-4) 
D) 0.01 M HClO (Ka = 3.0 × 10-8) 
E) These will all exhibit the same percentage ionization.

Question 12

The conjugate base of H2PO4- is __________.

Accepted Answer

A) PO4-3 
B) H2PO4 
C) H3PO4 
D) HPO4-2 
E) none of the above 
A) PO4-3 
B) H2PO4 
C) H3PO4 
D) HPO4-2 
E) none of the above

Question 13

A substance that is capable of acting as both an acid and as a base is __________.

Accepted Answer

A) autosomal 
B) conjugated 
C) amphoteric 
D) saturated 
E) miscible 
A) autosomal 
B) conjugated 
C) amphoteric 
D) saturated 
E) miscible

Question 14

An aqueous solution contains 0.150 M HCl at 25.0°C. The pH of the solution is __________.

Accepted Answer

A) 0.150 
B) 1.00 
C) 13.00 
D) 7.00 
E) 0.82 
A) 0.150 
B) 1.00 
C) 13.00 
D) 7.00 
E) 0.82

Question 15

The acid-dissociation constants of sulfurous acid (H2SO3)are Kal = 1.7 × 10-2 and Ka2 = 6.4 × 10-8 at 25.0°C. Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.

Accepted Answer

A) 4.53 
B) 1.28 
C) 1.86 
D) 6.21 
E) 1.93 
A) 4.53 
B) 1.28 
C) 1.86 
D) 6.21 
E) 1.93

Question 16

Classify the following compounds as weak bases (W)or strong bases (S): methylamine carbonate ion potassium hydroxide

Accepted Answer

A) W W S 
B) S S S 
C) S W W 
D) W S S 
E) W S W 
A) W W S 
B) S S S 
C) S W W 
D) W S S 
E) W S W

Question 17

Classify the following compounds as weak acids (W)or strong acids (S): hypochlorous acid perchloric acid chloric acid

Accepted Answer

A) W S S 
B) S S S 
C) S W W 
D) W W W 
E) W S W 
A) W S S 
B) S S S 
C) S W W 
D) W W W 
E) W S W

Question 18

What is the pH of an aqueous solution at 25.0°C in which [H+] is 0.0025 M?

Accepted Answer

A) 5.99 
B) 2.60 
C) -2.60 
D) -5.99 
E) none of the above 
A) 5.99 
B) 2.60 
C) -2.60 
D) -5.99 
E) none of the above

Question 19

Of the following, which is the strongest acid?

Accepted Answer

A) HClO 
B) HClO3 
C) HClO2 
D) HClO4 
E) HIO 
A) HClO 
B) HClO3 
C) HClO2 
D) HClO4 
E) HIO

Question 20

Using the data in the table, which of the conjugate bases below is the strongest base?

Accepted Answer

A) OAc- 
B) CHO2- 
C) ClO- 
D) F- 
E) OAc- and CHO2- 
A) OAc- 
B) CHO2- 
C) ClO- 
D) F- 
E) OAc- and CHO2-

Exam 16: Acid-Base Equilibria

An acid containing the COOH group is called a carbo-oxy acid.

A solution of formic acid is 3.0% dissociated at 25.0°C. What is the original concentration (in M)of the formic acid solution? The Ka at 25.0 °C for formic acid is 1.8 × 10-4.

In the gas phase reaction below, NH3 is acting as a(n)__________ base but not as a(n)__________ base. H+ . . | N + H+ → N | | H H H H H H

Calculate the pH of 0.586 M anilinium hydrochloride (C6H5NH3Cl)solution in water, given that Kb for aniline is 3.83 × 10-4.

Classify the following compounds as weak bases (W)or strong bases (S): ammonia fluoride ion sodium hydroxide

Using the data in the table, which of the conjugate acids below is the weakest acid?

Ka for HCN is 4.9 × 10-10. What is the pH of a 0.068 M aqueous solution of sodium cyanide?

Classify the following compounds as weak acids (W)or strong acids (S): nitrous acid hydrochloric acid hydrofluoric acid

Which of the following ions will act as a weak base in water?

Kb for NH3 is 1.8 × 10-5. What is the pOH of a 0.15 M aqueous solution of NH4Cl at 25.0 °C?

In which of the following aqueous solutions does the weak acid exhibit the lowest percentage ionization?

The conjugate base of H2PO4- is __________.

A substance that is capable of acting as both an acid and as a base is __________.

An aqueous solution contains 0.150 M HCl at 25.0°C. The pH of the solution is __________.

The acid-dissociation constants of sulfurous acid (H2SO3)are Kal = 1.7 × 10-2 and Ka2 = 6.4 × 10-8 at 25.0°C. Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.

Classify the following compounds as weak bases (W)or strong bases (S): methylamine carbonate ion potassium hydroxide

Classify the following compounds as weak acids (W)or strong acids (S): hypochlorous acid perchloric acid chloric acid

What is the pH of an aqueous solution at 25.0°C in which [H+] is 0.0025 M?

Of the following, which is the strongest acid?

Using the data in the table, which of the conjugate bases below is the strongest base?

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

Additional Aspects of Aqueous 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

A solution of formic acid is 3.0% dissociated at 25.0°C. What is the original concentration (in M)of the formic acid solution? The K_a at 25.0 °C for formic acid is 1.8 × 10^-4.

In the gas phase reaction below, NH₃ is acting as a(n) base but not as a(n) base. H⁺ . . | N + H⁺ → N | | H H H H H H

Calculate the pH of 0.586 M anilinium hydrochloride (C₆H₅NH₃Cl)solution in water, given that K_b for aniline is 3.83 × 10^-4.

K_a for HCN is 4.9 × 10^-10. What is the pH of a 0.068 M aqueous solution of sodium cyanide?

K_b for NH₃ is 1.8 × 10^-5. What is the pOH of a 0.15 M aqueous solution of NH₄Cl at 25.0 °C?

The conjugate base of H₂PO₄^- is __________.

The acid-dissociation constants of sulfurous acid (H₂SO₃)are K_al = 1.7 × 10^-² and K_a2 = 6.4 × 10^-⁸ at 25.0°C. Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.

What is the pH of an aqueous solution at 25.0°C in which [H⁺] is 0.0025 M?