Question 1

Al(OH)3 is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with HNO3.

Accepted Answer

Al(OH)₃ + 3HNO₃ $\rarr$ Al(NO₃)₃ + 3H₂O

Question 2

A 0.10 M HF solution is 8.4% ionized. Calculate the H+ ion concentration.

Accepted Answer

A) 0.84 M 
B) 0.12 M 
C) 0.10 M 
D) 0.084 M 
E) 8.4 * 10-3 M 
A) 0.84 M 
B) 0.12 M 
C) 0.10 M 
D) 0.084 M 
E) 8.4 * 10-3 M E

Question 3

Write the chemical formula for phosphoric acid.

Accepted Answer

H3PO4

Question 4

Identify the conjugate acid-base pairs in the reaction
HSO4- + HF $\rarr$ H2SO4 + F-
 One conjugate acid-base pair is _______________; the other acid-base pair is ______________.

Accepted Answer

HF-F-; H<

Question 5

Acid strength decreases in the series: HNO3 > HF > CH3COOH. Which of these species is the strongest base?

Accepted Answer

A) NO3- 
B) CH3COO- 
C) F- 
D) CH3COOH 
A) NO3- 
B) CH3COO- 
C) F- 
D) CH3COOH

Question 6

An unknown substance was added to a solution and the pH decreases. What type of substance was added?

Accepted Answer

The answer of An unknown substance was added to a...

Question 7

A 0.10 M NH3 solution is 1.3% ionized. Calculate the H+ ion concentration. NH3 + H2O $\rarr$ NH4+ + OH-

Accepted Answer

A) 1.3 * 10-3 M 
B) 7.7 * 10-2 M 
C) 7.7 * 10-12 M 
D) 0.13 M 
E) 0.10 M 
A) 1.3 * 10-3 M 
B) 7.7 * 10-2 M 
C) 7.7 * 10-12 M 
D) 0.13 M 
E) 0.10 M

Question 8

What is the pH of an aqueous solution that contains 2.7 * 1020 H3O+ ions per liter of solution?

Accepted Answer

A) 2.70 
B) 3.35 
C) 6.02 
D) 10.65 
E) 11.30 
A) 2.70 
B) 3.35 
C) 6.02 
D) 10.65 
E) 11.30

Question 9

Rain collected on a remote island in the Pacific assumed to be unaffected by human pollution. The pH of the rainwater on this island was not 7. Do you expect the pH to be greater than 7 or less than 7? Explain your reasoning.

Accepted Answer

The pH is expected to be less

Question 10

Which one of these equations represents the reaction of a weak acid with a strong base?

Accepted Answer

A) H+(aq)+ OH-(aq)$\rarr$H2O(aq) 
B) H+(aq)+ CH3NH2(aq)$\rarr$CH3NH3+(aq) 
C) OH-(aq)+ HCN(aq)$\rarr$H2O(aq)+ CN-(aq) 
D) HCN(aq)+ CH3NH2(aq)$\rarr$CH3NH3+(aq)+ CN-(aq) 
A) H+(aq)+ OH-(aq)$\rarr$H2O(aq) 
B) H+(aq)+ CH3NH2(aq)$\rarr$CH3NH3+(aq) 
C) OH-(aq)+ HCN(aq)$\rarr$H2O(aq)+ CN-(aq) 
D) HCN(aq)+ CH3NH2(aq)$\rarr$CH3NH3+(aq)+ CN-(aq)

Question 11

In 0.10 M KCN, the chemical species with the highest concentration (except H2O)is

Accepted Answer

A) Na+. 
B) CN-. 
C) H3O+ (or H+). 
D) OH-. 
E) K+. 
A) Na+. 
B) CN-. 
C) H3O+ (or H+). 
D) OH-. 
E) K+.

Question 12

Identify the conjugate base of HSO4 - in the reaction H2PO4- + HSO4- $\rarr$H3PO4 + SO42-

Accepted Answer

A) H2PO4- 
B) H2SO4 
C) H2O 
D) H3PO4 
E) SO42- 
A) H2PO4- 
B) H2SO4 
C) H2O 
D) H3PO4 
E) SO42-

Question 13

Which response gives the products of hydrolysis of KF?

Accepted Answer

A) KOH + HF 
B) OH- + HF 
C) KOH + H+ + F- 
D) KH + F- + OH- 
E) No hydrolysis occurs. 
A) KOH + HF 
B) OH- + HF 
C) KOH + H+ + F- 
D) KH + F- + OH- 
E) No hydrolysis occurs.

Question 14

Predict the direction in which the equilibrium will lie for the reaction H2CO3 + F- $\rarr$HCO3- + HF. Ka1(H2CO3)= 4.2 * 10-7; Ka(HF)= 7.1 * 10-4

Accepted Answer

A) to the right 
B) to the left 
C) in the middle 
A) to the right 
B) to the left 
C) in the middle

Question 15

Which of the following yields an acidic solution when dissolved in water?

Accepted Answer

A) NO2 
B) LiOH 
C) K2O 
D) NaCl 
E) Ca(OH)2 
A) NO2 
B) LiOH 
C) K2O 
D) NaCl 
E) Ca(OH)2

Question 16

If the pH of tomato juice is 4.0, what is the hydroxide ion concentration in this solution?

Accepted Answer

1 * 10<sup

Question 17

Identify the conjugate base of CH3COOH in the reaction CH3COOH + HSO4- $\rarr$ H2SO4 + CH3COO-

Accepted Answer

A) HSO4- 
B) SO42- 
C) CH3COO- 
D) H2SO4 
E) OH- 
A) HSO4- 
B) SO42- 
C) CH3COO- 
D) H2SO4 
E) OH-

Question 18

Calculate the pH of a 1.6 M KOH solution.

Accepted Answer

A) 1.60 
B) -0.20 
C) 0.20 
D) 14.20 
E) 13.80 
A) 1.60 
B) -0.20 
C) 0.20 
D) 14.20 
E) 13.80

Question 19

Which of these acids is stronger, H3PO4 or H3AsO4?

Accepted Answer

Question 20

Write the chemical formula for hydrochloric acid.

Accepted Answer

The answer of Write the chemical formula for hydrochloric acid....

Exam 16: Acids and Bases

Al(OH)3 is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with HNO3.

A 0.10 M HF solution is 8.4% ionized. Calculate the H+ ion concentration.

Write the chemical formula for phosphoric acid.

Identify the conjugate acid-base pairs in the reaction HSO4- + HF →\rarr→ H2SO4 + F- One conjugate acid-base pair is _______________; the other acid-base pair is ______________.

Acid strength decreases in the series: HNO3 > HF > CH3COOH. Which of these species is the strongest base?

An unknown substance was added to a solution and the pH decreases. What type of substance was added?

A 0.10 M NH3 solution is 1.3% ionized. Calculate the H+ ion concentration. NH3 + H2O →\rarr→ NH4+ + OH-

What is the pH of an aqueous solution that contains 2.7 * 1020 H3O+ ions per liter of solution?

Rain collected on a remote island in the Pacific assumed to be unaffected by human pollution. The pH of the rainwater on this island was not 7. Do you expect the pH to be greater than 7 or less than 7? Explain your reasoning.

Which one of these equations represents the reaction of a weak acid with a strong base?

In 0.10 M KCN, the chemical species with the highest concentration (except H2O)is

Identify the conjugate base of HSO4 - in the reaction H2PO4- + HSO4- →\rarr→ H3PO4 + SO42-

Which response gives the products of hydrolysis of KF?

Predict the direction in which the equilibrium will lie for the reaction H2CO3 + F- →\rarr→ HCO3- + HF. Ka1(H2CO3)= 4.2 * 10-7; Ka(HF)= 7.1 * 10-4

Which of the following yields an acidic solution when dissolved in water?

If the pH of tomato juice is 4.0, what is the hydroxide ion concentration in this solution?

Identify the conjugate base of CH3COOH in the reaction CH3COOH + HSO4- →\rarr→ H2SO4 + CH3COO-

Calculate the pH of a 1.6 M KOH solution.

Which of these acids is stronger, H3PO4 or H3AsO4?

Write the chemical formula for hydrochloric acid.

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Al(OH)₃ is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with HNO₃.

A 0.10 M HF solution is 8.4% ionized. Calculate the H⁺ ion concentration.

Identify the conjugate acid-base pairs in the reaction HSO₄^- + HF $\rarr$ H₂SO₄ + F^- One conjugate acid-base pair is _; the other acid-base pair is .

Acid strength decreases in the series: HNO₃> HF > CH₃COOH. Which of these species is the strongest base?

A 0.10 M NH₃ solution is 1.3% ionized. Calculate the H⁺ ion concentration. NH₃ + H₂O $\rarr$ NH₄⁺ + OH^-

What is the pH of an aqueous solution that contains 2.7 * 10²⁰ H₃O⁺ ions per liter of solution?

In 0.10 M KCN, the chemical species with the highest concentration (except H₂O)is

Identify the conjugate base of HSO₄^- in the reaction H₂PO₄^- + HSO₄^- $\rarr$ H₃PO₄ + SO₄^2-

Predict the direction in which the equilibrium will lie for the reaction H₂CO₃ + F^- $\rarr$ HCO₃^- + HF. K_a1(H₂CO₃)= 4.2 * 10^-7; K_a(HF)= 7.1 * 10^-4

Identify the conjugate base of CH₃COOH in the reaction CH₃COOH + HSO₄^- $\rarr$ H₂SO₄ + CH₃COO^-

Which of these acids is stronger, H₃PO₄ or H₃AsO₄?