Question 1

The Kb value for methylamine is 4.2 × 10-4.What is the pH of an aqueous solution for which the label reads "0.042 M CH3NH2"?

Accepted Answer

A) 2.4 
B) 4.8 
C) 9.2 
D) 11.6 
E) 12.3 
A) 2.4 
B) 4.8 
C) 9.2 
D) 11.6 
E) 12.3

Question 2

In the reaction BF3 + NH3 ⇌ F3B:NH3,BF3 acts as:

Accepted Answer

A) an Arrhenius base 
B) a Lewis base 
C) a Br∅nsted acid 
D) a Lewis acid 
E) an Arrhenius acid 
A) an Arrhenius base 
B) a Lewis base 
C) a Br∅nsted acid 
D) a Lewis acid 
E) an Arrhenius acid

Question 3

What is the hydronium ion concentration of a 0.150 mol L-1 aqueous hypochlorous acid solution with  
The equation for the dissociation of hypochlorous acid is below:

Accepted Answer

A) 1.9 × 10-4 mol L-1 
B) 7.2 × 10-4 mol L-1 
C) 2.8 × 10-5 mol L-1 
D) 7.2 × 10-5 mol L-1 
A) 1.9 × 10-4 mol L-1 
B) 7.2 × 10-4 mol L-1 
C) 2.8 × 10-5 mol L-1 
D) 7.2 × 10-5 mol L-1

Question 4

What is the pH of a 0.120 M aqueous solution of the sodium salt of acetylsalicylic acid (aspirin)?
Ka (aspirin)= 3.3 × 10-4

Accepted Answer

A) 7.0 
B) 11.8 
C) 2.2 
D) 5.7 
E) 8.3 
A) 7.0 
B) 11.8 
C) 2.2 
D) 5.7 
E) 8.3

Question 5

What is the [OH-] of a solution prepared by dissolving 0.0912 g of hydrogen chloride in sufficient pure water to prepare 250.0 ml of solution?

Accepted Answer

A) 1.00 × 10-2 M 
B) 1.00 × 10-8 M 
C) 1.00 × 10-12 M 
D) 1.00 × 10-4 M 
E) 1.0 M 
A) 1.00 × 10-2 M 
B) 1.00 × 10-8 M 
C) 1.00 × 10-12 M 
D) 1.00 × 10-4 M 
E) 1.0 M

Question 6

Which of the following is the strongest base?

Accepted Answer

A) Cl-  
B) ClO4-  
C) F-  
D) NO3-  
E) H2O 
A) Cl-  
B) ClO4-  
C) F-  
D) NO3-  
E) H2O

Question 7

What is the pH of a 0.563 M aqueous solution of ammonium bromide? Kb (NH3)= 1.8 × 10-5

Accepted Answer

A) 2.50 
B) 11.50 
C) 4.75 
D) 4.63 
E) 9.25 
A) 2.50 
B) 11.50 
C) 4.75 
D) 4.63 
E) 9.25

Question 8

What is the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of

Accepted Answer

A) 4.44 × 10-12 mol L-1 and 2.648 
B) 4.44 × 10-12 mol L-1 and 11.352 
C) 4.44 × 10-13 mol L-1 and 1.648 
D) 4.44 × 10-13 mol L-1 and 12.352 
A) 4.44 × 10-12 mol L-1 and 2.648 
B) 4.44 × 10-12 mol L-1 and 11.352 
C) 4.44 × 10-13 mol L-1 and 1.648 
D) 4.44 × 10-13 mol L-1 and 12.352

Question 9

A saturated aqueous solution of calcium hydroxide has a pH of 12.25.What is the [Ca2+] in such a solution?

Accepted Answer

A) 0.018 
B) 5.6 × 10-13  
C) 2.3 × 10-5  
D) 0.035 
E) 8.9 × 10-3  
A) 0.018 
B) 5.6 × 10-13  
C) 2.3 × 10-5  
D) 0.035 
E) 8.9 × 10-3

Question 10

What is the [H2PO4-] of an aqueous solution labeled "0.10 M phosphoric acid"?
[Ka1 = 7.1 × 10-3;Ka2 = 6.3 × 10-8;Ka3 = 4.2 × 10-13]

Accepted Answer

A) 0.023 M 
B) 6.3 × 10-8 M 
C) 7.1 × 10-3 M 
D) 4.2 × 10-13 M 
E) 0.013 M 
A) 0.023 M 
B) 6.3 × 10-8 M 
C) 7.1 × 10-3 M 
D) 4.2 × 10-13 M 
E) 0.013 M

Question 11

What is the pH of a 0.475 M aqueous solution of sodium nitrite? Ka (nitrous acid)= 7.2 × 10-4

Accepted Answer

A) 8.58 
B) 8.41 
C) 12.27 
D) 5.42 
E) 5.59 
A) 8.58 
B) 8.41 
C) 12.27 
D) 5.42 
E) 5.59

Question 12

Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 × 10-4 mol L-1 in hydronium ion.

Accepted Answer

A) 2.86 × 10-3 mol L-1 
B) 2.86 × 10-10 mol L-1 
C) 2.86 × 10-11 mol L-1 
D) 3.50 × 10-11 mol L-1 
A) 2.86 × 10-3 mol L-1 
B) 2.86 × 10-10 mol L-1 
C) 2.86 × 10-11 mol L-1 
D) 3.50 × 10-11 mol L-1

Question 13

What is the concentration of free sulfate ion in an aqueous solution labeled "3.6 M H2SO4"?
[Ka2 = 1.1 × 10-2]

Accepted Answer

A) 0.011 M 
B) 0.040 M 
C) 0.20 M 
D) 0.60 M 
E) 1.8 M 
A) 0.011 M 
B) 0.040 M 
C) 0.20 M 
D) 0.60 M 
E) 1.8 M

Question 14

Br∅nsted and Lowry suggested that bases be defined as proton acceptors.

Accepted Answer

A) True 
 B)False

Question 15

What is the pH of an aqueous solution labeled "0.50 M sodium fluoride" if the ionization constant of hydrofluoric acid is 6.0 × 10-4?

Accepted Answer

A) 10.8 
B) 8.5 
C) 7.1 
D) 6.9 
E) 5.5 
A) 10.8 
B) 8.5 
C) 7.1 
D) 6.9 
E) 5.5

Question 16

For NH4Cl,predict whether the aqueous solution is acidic,basic or neutral and why.

Accepted Answer

A) acidic because NH4Cl is a strong acid 
B) basic because NH4Cl is a weak base 
C) neutral because there is no hydrolysis 
D) basic because NH4Cl is the salt of a weak acid 
E) acidic because NH4Cl is the salt of a weak base 
A) acidic because NH4Cl is a strong acid 
B) basic because NH4Cl is a weak base 
C) neutral because there is no hydrolysis 
D) basic because NH4Cl is the salt of a weak acid 
E) acidic because NH4Cl is the salt of a weak base

Question 17

Consider the reaction:
HC2H3O2 + H2O ⇌ H3O+ + C2H3O2-
Choose the pair of substances that are both bases in the reaction.

Accepted Answer

A) HC2H3O2 and H3O+  
B) H2O and C2H3O2-  
C) H2O and H3O+  
D) HC2H3O2 and C2H3O2-  
E) H3O+ and HC2H3O2 
A) HC2H3O2 and H3O+  
B) H2O and C2H3O2-  
C) H2O and H3O+  
D) HC2H3O2 and C2H3O2-  
E) H3O+ and HC2H3O2

Exam 16: Acids and Bases

The Kb value for methylamine is 4.2 × 10-4.What is the pH of an aqueous solution for which the label reads "0.042 M CH3NH2"?

In the reaction BF3 + NH3 ⇌ F3B:NH3,BF3 acts as:

What is the hydronium ion concentration of a 0.150 mol L-1 aqueous hypochlorous acid solution with The equation for the dissociation of hypochlorous acid is below:

What is the pH of a 0.120 M aqueous solution of the sodium salt of acetylsalicylic acid (aspirin)? Ka (aspirin)= 3.3 × 10-4

What is the [OH-] of a solution prepared by dissolving 0.0912 g of hydrogen chloride in sufficient pure water to prepare 250.0 ml of solution?

Which of the following is the strongest base?

What is the pH of a 0.563 M aqueous solution of ammonium bromide? Kb (NH3)= 1.8 × 10-5

What is the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of

A saturated aqueous solution of calcium hydroxide has a pH of 12.25.What is the [Ca2+] in such a solution?

What is the [H2PO4-] of an aqueous solution labeled "0.10 M phosphoric acid"? [Ka1 = 7.1 × 10-3;Ka2 = 6.3 × 10-8;Ka3 = 4.2 × 10-13]

What is the pH of a 0.475 M aqueous solution of sodium nitrite? Ka (nitrous acid)= 7.2 × 10-4

Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 × 10-4 mol L-1 in hydronium ion.

What is the concentration of free sulfate ion in an aqueous solution labeled "3.6 M H2SO4"? [Ka2 = 1.1 × 10-2]

Br∅nsted and Lowry suggested that bases be defined as proton acceptors.

What is the pH of an aqueous solution labeled "0.50 M sodium fluoride" if the ionization constant of hydrofluoric acid is 6.0 × 10-4?

For NH4Cl,predict whether the aqueous solution is acidic,basic or neutral and why.

Consider the reaction: HC2H3O2 + H2O ⇌ H3O+ + C2H3O2- Choose the pair of substances that are both bases in the reaction.

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

The K_b value for methylamine is 4.2 × 10^-4.What is the pH of an aqueous solution for which the label reads "0.042 M CH₃NH₂"?

In the reaction BF₃ + NH₃ ⇌ F₃B:NH₃,BF₃ acts as:

What is the hydronium ion concentration of a 0.150 mol L^-1 aqueous hypochlorous acid solution with The equation for the dissociation of hypochlorous acid is below:

What is the pH of a 0.120 M aqueous solution of the sodium salt of acetylsalicylic acid (aspirin)? K_a (aspirin)= 3.3 × 10^-4

What is the [OH^-] of a solution prepared by dissolving 0.0912 g of hydrogen chloride in sufficient pure water to prepare 250.0 ml of solution?

What is the pH of a 0.563 M aqueous solution of ammonium bromide? K_b (NH₃)= 1.8 × 10^-5

What is the hydronium ion concentration and the pH for an aqueous solution of NH₃ that has a hydroxide ion concentration of

A saturated aqueous solution of calcium hydroxide has a pH of 12.25.What is the [Ca²⁺] in such a solution?

What is the [H₂PO₄^-] of an aqueous solution labeled "0.10 M phosphoric acid"? [K_a1 = 7.1 × 10^-3;K_a2 = 6.3 × 10^-8;K_a3 = 4.2 × 10^-13]

What is the pH of a 0.475 M aqueous solution of sodium nitrite? Ka (nitrous acid)= 7.2 × 10^-4

Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 × 10^-⁴ mol L^-1 in hydronium ion.

What is the concentration of free sulfate ion in an aqueous solution labeled "3.6 M H₂SO₄"? [K_a2 = 1.1 × 10^-2]

What is the pH of an aqueous solution labeled "0.50 M sodium fluoride" if the ionization constant of hydrofluoric acid is 6.0 × 10^-4?

For NH₄Cl,predict whether the aqueous solution is acidic,basic or neutral and why.

Consider the reaction: HC₂H₃O₂ + H₂O ⇌ H₃O⁺ + C₂H₃O₂^- Choose the pair of substances that are both bases in the reaction.