Question 1

The conjugate base of CH3NH3+ is ________.

Accepted Answer

A) CH3NH2+ 
B) CH3NH2- 
C) CH3NH+ 
D) CH3NH2 
E) none of the above 
A) CH3NH2+ 
B) CH3NH2- 
C) CH3NH+ 
D) CH3NH2 
E) none of the above

Question 2

What is the pH of a 0.030 M aqueous solution of calcium hydroxide?

Accepted Answer

A) 1.52 
B) 12.48 
C) 10.41 
D) 12.78 
E) 1.22 
A) 1.52 
B) 12.48 
C) 10.41 
D) 12.78 
E) 1.22

Question 3

Which of the following aqueous solutions has the lowest [OH-]?

Accepted Answer

A) a solution with a pH of 3.0 
B) a 1 × 10-4 M solution of HN   
C) a solution with a pOH of 12.0 
D) pure water 
E) a 1 × 10-3 M solution of N   Cl 
A) a solution with a pH of 3.0 
B) a 1 × 10-4 M solution of HN   
C) a solution with a pOH of 12.0 
D) pure water 
E) a 1 × 10-3 M solution of N   Cl

Question 4

The pH of a 0.60 M aqueous solution of formic acid,HCHO2,at 25.0 °C is 1.98.What is the value of Ka for formic acid?

Accepted Answer

A) 2.0 × 10-5 
B) 1.8 × 10-4 
C) 6.0 × 10-5 
D) 3.5 × 10-4 
E) none of the above 
A) 2.0 × 10-5 
B) 1.8 × 10-4 
C) 6.0 × 10-5 
D) 3.5 × 10-4 
E) none of the above

Question 5

Which of the following salts will produce a basic solution?

Accepted Answer

A) Mg(ClO4)2 
B) RbBr 
C) Na2SO3 
D) NH4NO3 
E) KNO3 
A) Mg(ClO4)2 
B) RbBr 
C) Na2SO3 
D) NH4NO3 
E) KNO3

Question 6

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

Accepted Answer

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

Question 7

Of the compounds below,a 0.1 M aqueous solution of ________ will have the highest pH.

Accepted Answer

A) KCN, Ka of HCN = 4.0 × 10-10 
B) NH4NO3, Kb of NH3 = 1.8 × 10-5 
C) NaOAc, Ka of HOAc = 1.8 × 10-5 
D) NaClO, Ka of HClO = 3.2 × 10-8 
E) NaHS, Kb of HS- = 1.8 × 10-7 
A) KCN, Ka of HCN = 4.0 × 10-10 
B) NH4NO3, Kb of NH3 = 1.8 × 10-5 
C) NaOAc, Ka of HOAc = 1.8 × 10-5 
D) NaClO, Ka of HClO = 3.2 × 10-8 
E) NaHS, Kb of HS- = 1.8 × 10-7

Question 8

What is the pH of a 0.40 M aqueous solution of N   Br at 25.0 °C?   for N   is 1.8 ×   .

Accepted Answer

A) 4.82 
B) 2.57 
C) 9.18 
D) 11.43 
E) 11.23 
A) 4.82 
B) 2.57 
C) 9.18 
D) 11.43 
E) 11.23

Question 9

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

Accepted Answer

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

Question 10

What is the [   ] (M)of a solution with a concentration of   and Kb is 6.4 ×   at 25.0 °C?

Accepted Answer

A) 3.3 ×   
B) 2.7 ×   
C) 3.0 ×   
D) 3.7 ×   
E) 11.43 
A) 3.3 ×   
B) 2.7 ×   
C) 3.0 ×   
D) 3.7 ×   
E) 11.43

Question 11

The pOH of a 0.10 M solution of a weak base is 4.18.What is the Kb for this base?

Accepted Answer

A) 8.8 × 10-8 
B) 2.1 × 10-4 
C) 6.6 × 10-4 
D) 4.4 × 10-8 
E) 2.0 × 10-5 
A) 8.8 × 10-8 
B) 2.1 × 10-4 
C) 6.6 × 10-4 
D) 4.4 × 10-8 
E) 2.0 × 10-5

Question 12

Of the following,which is the strongest acid?

Accepted Answer

A) HIO4 
B) HIO3 
C) HIO2 
D) HIO 
E) The acid strength of all of the above is the same. 
A) HIO4 
B) HIO3 
C) HIO2 
D) HIO 
E) The acid strength of all of the above is the same.

Question 13

An aqueous solution of ammonia at 25.0 °C has a [O   ] of 0.0010 M.What is the pOH of the solution?

Accepted Answer

A) 11.00 
B) 3.00 
C) -3.00 
D) 6.91 
E) -11.00 
A) 11.00 
B) 3.00 
C) -3.00 
D) 6.91 
E) -11.00

Question 14

In the gas phase reaction below,NH3 is acting as a(n)________.

Accepted Answer

A) Br∅nsted-Lowry acid 
B) Br∅nsted-Lowry base 
C) Lewis base 
D) Lewis acid 
E) Arrhenius acid 
A) Br∅nsted-Lowry acid 
B) Br∅nsted-Lowry base 
C) Lewis base 
D) Lewis acid 
E) Arrhenius acid

Question 15

Ka for HA is 4.9 × 10-10.What is the pH of a 0.068 M aqueous solution of A-?

Accepted Answer

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

Question 16

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

Accepted Answer

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

Question 17

A Br∅nsted-Lowry base is defined as a substance that ________.

Accepted Answer

A) increases [H+] when placed in H2O 
B) decreases [H+] when placed in H2O 
C) increases [OH-] when placed in H2O 
D) acts as a proton acceptor 
E) acts as a proton donor 
A) increases [H+] when placed in H2O 
B) decreases [H+] when placed in H2O 
C) increases [OH-] when placed in H2O 
D) acts as a proton acceptor 
E) acts as a proton donor

Question 18

Which solution will be the most basic?

Accepted Answer

A) 0.10 M Ba(OH)2 
B) 0.10 M KOH 
C) 0.10 M H2O 
D) 0.10 M CH3OH 
E) All solutions have equal basicity. 
A) 0.10 M Ba(OH)2 
B) 0.10 M KOH 
C) 0.10 M H2O 
D) 0.10 M CH3OH 
E) All solutions have equal basicity.

Question 19

What is the pOH of a sodium fluoride solution prepared by adding 0.4198 grams of sodium fluoride to 100.0 ml of water at 25.0 °C?
 The Ka at 25.0 °C for HF is 7.2 × 10-4.

Accepted Answer

Question 20

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

Accepted Answer

A) OAc- 
B) C7H5O2- 
C) NO2- 
D)    
E) OAc- and C7H5O2- 
A) OAc- 
B) C7H5O2- 
C) NO2- 
D)    
E) OAc- and C7H5O2-

Exam 16: Acid-Base Equilibria

The conjugate base of CH3NH3+ is ________.

What is the pH of a 0.030 M aqueous solution of calcium hydroxide?

Which of the following aqueous solutions has the lowest [OH-]?

The pH of a 0.60 M aqueous solution of formic acid,HCHO2,at 25.0 °C is 1.98.What is the value of Ka for formic acid?

Which of the following salts will produce a basic solution?

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

Of the compounds below,a 0.1 M aqueous solution of ________ will have the highest pH.

What is the pH of a 0.40 M aqueous solution of N Br at 25.0 °C? for N is 1.8 × .

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

What is the [ ] (M)of a solution with a concentration of and Kb is 6.4 × at 25.0 °C?

The pOH of a 0.10 M solution of a weak base is 4.18.What is the Kb for this base?

Of the following,which is the strongest acid?

An aqueous solution of ammonia at 25.0 °C has a [O ] of 0.0010 M.What is the pOH of the solution?

In the gas phase reaction below,NH3 is acting as a(n)________.

Ka for HA is 4.9 × 10-10.What is the pH of a 0.068 M aqueous solution of A-?

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

A Br∅nsted-Lowry base is defined as a substance that ________.

Which solution will be the most basic?

What is the pOH of a sodium fluoride solution prepared by adding 0.4198 grams of sodium fluoride to 100.0 ml of water at 25.0 °C? The Ka at 25.0 °C for HF is 7.2 × 10-4.

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

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 conjugate base of CH₃NH₃⁺ is ________.

Which of the following aqueous solutions has the lowest [OH^-]?

The pH of a 0.60 M aqueous solution of formic acid,HCHO₂,at 25.0 °C is 1.98.What is the value of K_a for formic acid?

What is the [ ] (M)of a solution with a concentration of and K_b is 6.4 × at 25.0 °C?

The pOH of a 0.10 M solution of a weak base is 4.18.What is the K_b for this base?

In the gas phase reaction below,NH₃ is acting as a(n)________.

K_a for HA is 4.9 × 10^-10.What is the pH of a 0.068 M aqueous solution of A^-?

What is the pOH of a sodium fluoride solution prepared by adding 0.4198 grams of sodium fluoride to 100.0 ml of water at 25.0 °C? The K_a at 25.0 °C for HF is 7.2 × 10^-4.