Question 1

The magnitude of Kw indicates that ________.

Accepted Answer

A) water autoionizes very slowly 
B) water autoionizes very quickly 
C) water autoionizes only to a very small extent 
D) the autoionization of water is exothermic 
A) water autoionizes very slowly 
B) water autoionizes very quickly 
C) water autoionizes only to a very small extent 
D) the autoionization of water is exothermic C

Question 2

The conjugate base of HSO4- is ________.

Accepted Answer

A) H2SO4 
B) HSO4+ 
C) H+ 
D) SO42- 
E) HSO3+ 
A) H2SO4 
B) HSO4+ 
C) H+ 
D) SO42- 
E) HSO3+ D

Question 3

What is the pH of 0.626 M anilinium hydrochloride (     N   Cl)solution in water,given that   for aniline is 3.83 ×   ?

Accepted Answer

A) 1.81 
B) 5.39 
C) 12.19 
D) 12.42 
E) 8.61 
A) 1.81 
B) 5.39 
C) 12.19 
D) 12.42 
E) 8.61 B

Question 4

The   for formic acid (HCO2H)is 1.8 ×   .What is the pH of a 0.20 M aqueous solution of sodium formate (NaHC   )?

Accepted Answer

A) 11.64 
B) 5.48 
C) 3.39 
D) 8.52 
E) 4.26 
A) 11.64 
B) 5.48 
C) 3.39 
D) 8.52 
E) 4.26

Question 5

Which one of the following is a Br∅nsted-Lowry acid?

Accepted Answer

A) (CH3)3NH+ 
B) CH3COOH 
C) HF 
D) HNO2 
E) all of the above 
A) (CH3)3NH+ 
B) CH3COOH 
C) HF 
D) HNO2 
E) all of the above

Question 6

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

Accepted Answer

A) NH4+ 
B) C5H5NH+ 
C) NH3CH2CH3+ 
D) H3NOH+ 
E) NH4+ and NH3CH3+ 
A) NH4+ 
B) C5H5NH+ 
C) NH3CH2CH3+ 
D) H3NOH+ 
E) NH4+ and NH3CH3+

Question 7

The pH of a 0.55 M aqueous solution of hypobromous acid,HBrO,at 25.0 °C is 4.48.What is the value of Ka for HBrO?

Accepted Answer

A) 2.0 × 10-9 
B) 1.1 × 10-9 
C) 6.0 × 10-5 
D) 3.3 × 10-5 
E) 3.0 × 104 
A) 2.0 × 10-9 
B) 1.1 × 10-9 
C) 6.0 × 10-5 
D) 3.3 × 10-5 
E) 3.0 × 104

Question 8

The base-dissociation constant,Kb,for an unknown base is   The acid-dissociation constant,Ka,for the conjugate ion is ________.

Accepted Answer

A) 1.0 × 10-7 
B) 7.1 × 10-6 
C) 1.4 × 10-23 
D) 1.4 × 10-5 
E) 7.1 × 10-4 
A) 1.0 × 10-7 
B) 7.1 × 10-6 
C) 1.4 × 10-23 
D) 1.4 × 10-5 
E) 7.1 × 10-4

Question 9

The molar concentration of hydroxide ion in pure water at 25 °C is ________.

Accepted Answer

A) 1.00 
B) 0.00 
C) 1.0 × 10-14 
D) 1.0 × 10-7 
E) 7.00 
A) 1.00 
B) 0.00 
C) 1.0 × 10-14 
D) 1.0 × 10-7 
E) 7.00

Question 10

An aqueous solution contains 0.500 M NaOH at 25.0 °C.The pH of the solution is ________.

Accepted Answer

A) 0.500 
B) 13.70 
C) 0.301 
D) 7.00 
E) 13.50 
A) 0.500 
B) 13.70 
C) 0.301 
D) 7.00 
E) 13.50

Question 11

HA is a weak acid.Which equilibrium corresponds to the equilibrium constant Kb for A-?

Accepted Answer

A) HA (aq)+ H2O (l)   H2A+ (aq)+ OH-(aq) 
B) A- (aq)+ H3O+ (aq)   HA (aq)+ H2O (l) 
C) HA (aq)+ OH- (aq)   H2O (l)+ H+ (aq) 
D) A- (aq)+ H2O (l)   HA (aq)+ OH- (aq) 
E) A- (aq)+ OH- (aq)   HOA2- (aq) 
A) HA (aq)+ H2O (l)   H2A+ (aq)+ OH-(aq) 
B) A- (aq)+ H3O+ (aq)   HA (aq)+ H2O (l) 
C) HA (aq)+ OH- (aq)   H2O (l)+ H+ (aq) 
D) A- (aq)+ H2O (l)   HA (aq)+ OH- (aq) 
E) A- (aq)+ OH- (aq)   HOA2- (aq)

Question 12

What is the pH of an aqueous solution at 25.0 °C in which [O   ] is 0.0030 M?

Accepted Answer

A) 5.81 
B) -11.48 
C) 2.52 
D) -2.52 
E) 11.48 
A) 5.81 
B) -11.48 
C) 2.52 
D) -2.52 
E) 11.48

Question 13

The Ka of some acid,HA,at 25.0 °C is 4.9 ×   .What is the pH of a 0.050 M aqueous solution of A-?

Accepted Answer

A) 1.0 × 10-3 
B) 3.00 
C) 11.00 
D) 9.9 × 10-12 
E) 2.5 × 10-11 
A) 1.0 × 10-3 
B) 3.00 
C) 11.00 
D) 9.9 × 10-12 
E) 2.5 × 10-11

Question 14

Using the data in the table,which of the conjugate acids below is the strongest 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 15

An aqueous solution of a particular compound has pH = 7.46.The compound is ________.

Accepted Answer

A) a weak base 
B) a weak acid 
C) a strong acid 
D) a strong base 
E) a salt 
A) a weak base 
B) a weak acid 
C) a strong acid 
D) a strong base 
E) a salt

Question 16

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

Accepted Answer

A) 0.01 M H2SO3 (   = 1.4 ×   ) 
B) 0.01 M HCN (   = 6.2 ×   ) 
C) 0.01 M H2CO3 (   = 4.5 ×   ) 
D) 0.01 M HC3H5O2 (   = 1.3 ×   ) 
E) 0.01 M HOCl (   = 3.5 ×   ) 
A) 0.01 M H2SO3 (   = 1.4 ×   ) 
B) 0.01 M HCN (   = 6.2 ×   ) 
C) 0.01 M H2CO3 (   = 4.5 ×   ) 
D) 0.01 M HC3H5O2 (   = 1.3 ×   ) 
E) 0.01 M HOCl (   = 3.5 ×   )

Question 17

What is the pOH of 0.606 M anilinium hydrochloride (     N   Cl)solution in water,given that   for aniline is 3.83 ×   ?

Accepted Answer

A) 12.42 
B) 1.82 
C) 8.60 
D) 5.40 
E) 12.18 
A) 12.42 
B) 1.82 
C) 8.60 
D) 5.40 
E) 12.18

Question 18

What is the conjugate acid of OH-?

Accepted Answer

A) O2 
B) H2O 
C) O- 
D) O2- 
E) H3O+ 
A) O2 
B) H2O 
C) O- 
D) O2- 
E) H3O+

Question 19

What is the concentration (in M)of hydroxide ions in a solution at 25.0 °C with pH = 4.282?

Accepted Answer

A) 4.28 
B) 9.72 
C) 1.92 ×   
D) 5.22 ×   
E) none of the above 
A) 4.28 
B) 9.72 
C) 1.92 ×   
D) 5.22 ×   
E) none of the above

Question 20

Calculate the concentration (in M)of hydroxide ions in a solution at 25.0 °C with a pOH of 3.58.

Accepted Answer

A) 2.63 × 1010 
B) 3.80 × 10-11 
C) 1.00 × 10-7 
D) 3.80 × 103 
E) 2.63 × 10-4 
A) 2.63 × 1010 
B) 3.80 × 10-11 
C) 1.00 × 10-7 
D) 3.80 × 103 
E) 2.63 × 10-4

Exam 16: Acid-Base Equilibria

The magnitude of Kw indicates that ________.

The conjugate base of HSO4- is ________.

What is the pH of 0.626 M anilinium hydrochloride ( N Cl)solution in water,given that for aniline is 3.83 × ?

The for formic acid (HCO2H)is 1.8 × .What is the pH of a 0.20 M aqueous solution of sodium formate (NaHC )?

Which one of the following is a Br∅nsted-Lowry acid?

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

The pH of a 0.55 M aqueous solution of hypobromous acid,HBrO,at 25.0 °C is 4.48.What is the value of Ka for HBrO?

The base-dissociation constant,Kb,for an unknown base is The acid-dissociation constant,Ka,for the conjugate ion is ________.

The molar concentration of hydroxide ion in pure water at 25 °C is ________.

An aqueous solution contains 0.500 M NaOH at 25.0 °C.The pH of the solution is ________.

HA is a weak acid.Which equilibrium corresponds to the equilibrium constant Kb for A-?

What is the pH of an aqueous solution at 25.0 °C in which [O ] is 0.0030 M?

The Ka of some acid,HA,at 25.0 °C is 4.9 × .What is the pH of a 0.050 M aqueous solution of A-?

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

An aqueous solution of a particular compound has pH = 7.46.The compound is ________.

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

What is the pOH of 0.606 M anilinium hydrochloride ( N Cl)solution in water,given that for aniline is 3.83 × ?

What is the conjugate acid of OH-?

What is the concentration (in M)of hydroxide ions in a solution at 25.0 °C with pH = 4.282?

Calculate the concentration (in M)of hydroxide ions in a solution at 25.0 °C with a pOH of 3.58.

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

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

The magnitude of K_w indicates that ________.

The conjugate base of HSO₄^- is ________.

The for formic acid (HCO₂H)is 1.8 × .What is the pH of a 0.20 M aqueous solution of sodium formate (NaHC )?

The pH of a 0.55 M aqueous solution of hypobromous acid,HBrO,at 25.0 °C is 4.48.What is the value of K_a for HBrO?

The base-dissociation constant,K_b,for an unknown base is The acid-dissociation constant,K_a,for the conjugate ion is ________.

HA is a weak acid.Which equilibrium corresponds to the equilibrium constant K_b for A^-?

The K_a of some acid,HA,at 25.0 °C is 4.9 × .What is the pH of a 0.050 M aqueous solution of A^-?

What is the conjugate acid of OH^-?