Question 1

Select the pair of substances in which an acid is listed followed by its conjugate base.

Accepted Answer

A) H+,HCl 
B) NH3,NH4+ 
C) HPO42-,H2PO4- 
D) HCO3-,CO32- 
E) CH3COOH,CH3COOH2+ 
A) H+,HCl 
B) NH3,NH4+ 
C) HPO42-,H2PO4- 
D) HCO3-,CO32- 
E) CH3COOH,CH3COOH2+

Question 2

Which one of the following is a Lewis acid but not a Brønsted-Lowry acid?

Accepted Answer

A) Fe3+ 
B) H3O+ 
C) HSO4- 
D) NH3 
E) H2O 
A) Fe3+ 
B) H3O+ 
C) HSO4- 
D) NH3 
E) H2O

Question 3

Calcium oxide,CaO,also known as quick lime,will react with carbon dioxide to form calcium carbonate,CaCO3.Which species,if any,acts as a Lewis acid in the reaction?

Accepted Answer

A) Ca2+ 
B) O2- 
C) CO2 
D) CaCO3 
E) None of the species acts as a Lewis acid in this reaction. 
A) Ca2+ 
B) O2- 
C) CO2 
D) CaCO3 
E) None of the species acts as a Lewis acid in this reaction.

Question 4

Formic acid,HCOOH,is a weak acid with a pKa of 3.74.Draw up a reaction table for the reaction of 0.300 M formic acid with water,and calculate the pH of this solution.

Accepted Answer

@#IMG-DLM& Assuming 0.300 - x

Question 5

Consider the reaction:
BF3 + F- $\to$  BF4-
 Can this ever be considered to be an acid-base reaction? Support your answer with appropriate arguments.

Accepted Answer

Yes,according to Lewis,this is

Question 6

The pH of a 0.200 M solution of the weak base pyridine,C5H5N,is 8.59.Draw up a reaction table for the reaction of 0.200 M pyridine with water,and calculate Kb.

Accepted Answer

Question 7

An aqueous solution is prepared by dissolving the salt formed by the neutralization of a weak acid by a weak base.Which statement about the solution is correct?

Accepted Answer

A) The solution is strongly basic. 
B) The solution is weakly basic. 
C) The solution is neutral. 
D) The solution is acidic. 
E) The values for Ka and Kb for the species in solution must be known before a prediction can be made. 
A) The solution is strongly basic. 
B) The solution is weakly basic. 
C) The solution is neutral. 
D) The solution is acidic. 
E) The values for Ka and Kb for the species in solution must be known before a prediction can be made.

Question 8

What is the pH of a 0.00200 M HClO4 solution?

Accepted Answer

A) 0.995 
B) 1.378 
C) 2.699 
D) 6.215 
E) None of these choices is correct. 
A) 0.995 
B) 1.378 
C) 2.699 
D) 6.215 
E) None of these choices is correct.

Question 9

Define an acid according to the Lewis theory.Write a balanced equation in support of this definition,in which the acid is neither an Arrhenius acid nor a Brønsted-Lowry acid.

Accepted Answer

According to Lewis,an acid is an electro

Question 10

Define a base according to the Brønsted-Lowry theory.Write a balanced equation in support of this definition,in which the base is acting as a Brønsted-Lowry base but not as an Arrhenius base.

Accepted Answer

According to Brønsted and Lowr

Question 11

The substance Ba(OH)2 is considered

Accepted Answer

A) a weak Arrhenius acid. 
B) a weak Arrhenius base. 
C) a strong Arrhenius acid. 
D) a strong Arrhenius base. 
E) a neutral compound. 
A) a weak Arrhenius acid. 
B) a weak Arrhenius base. 
C) a strong Arrhenius acid. 
D) a strong Arrhenius base. 
E) a neutral compound.

Question 12

What is the pOH of a 0.0085 M KOH solution?

Accepted Answer

A) 2.07 
B) 4.77 
C) 9.23 
D) 11.93 
E) None of these choices is correct. 
A) 2.07 
B) 4.77 
C) 9.23 
D) 11.93 
E) None of these choices is correct.

Question 13

A solution is prepared by adding 0.10 mol of lithium nitrate,LiNO3,to 1.00 L of water.Which statement about the solution is correct?

Accepted Answer

A) The solution is basic. 
B) The solution is neutral. 
C) The solution is weakly acidic. 
D) The solution is strongly acidic. 
E) The values for Ka and Kb for the species in solution must be known before a prediction can be made. 
A) The solution is basic. 
B) The solution is neutral. 
C) The solution is weakly acidic. 
D) The solution is strongly acidic. 
E) The values for Ka and Kb for the species in solution must be known before a prediction can be made.

Question 14

A solution is prepared by adding 0.10 mol of potassium chloride,KCl,to 1.00 L of water.Which statement about the solution is correct?

Accepted Answer

A) The solution is basic. 
B) The solution is neutral. 
C) The solution is acidic. 
D) One needs to know the temperature before any of the above predictions can be made. 
E) The values for Ka and Kb for the species in solution must be known before a prediction can be made. 
A) The solution is basic. 
B) The solution is neutral. 
C) The solution is acidic. 
D) One needs to know the temperature before any of the above predictions can be made. 
E) The values for Ka and Kb for the species in solution must be known before a prediction can be made.

Question 15

Which of the following liquids contains the strongest acid?
0.1 M HA,pH = 6.85
0.1 M HD,pH = 7.22
0.1 M HE,pH = 8.34
0.1 M HJ,pH = 11.88
Pure water

Accepted Answer

A) HE 
B) HA 
C) HJ 
D) HD 
E) pure water 
A) HE 
B) HA 
C) HJ 
D) HD 
E) pure water

Question 16

Which of the following is considered a Lewis acid?

Accepted Answer

A) CH3NH2 
B) BCl3 
C) F- 
D) BF4- 
E) CH4 
A) CH3NH2 
B) BCl3 
C) F- 
D) BF4- 
E) CH4

Question 17

Which of the following is the strongest base?

Accepted Answer

A) CH3NH2 
B) NaNO3 
C) B(OH)3 
D) Al(OH)3 
E) LiOH 
A) CH3NH2 
B) NaNO3 
C) B(OH)3 
D) Al(OH)3 
E) LiOH

Question 18

Picric acid has been used in the leather industry and in etching copper.However,its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive.It has an acid dissociation constant of 0.42.What is the [H3O+] for a 0.20 M solution of picric acid?

Accepted Answer

A) 0.022 M 
B) 0.052 M 
C) 0.15 M 
D) 0.29 M 
E) None of these choices is correct. 
A) 0.022 M 
B) 0.052 M 
C) 0.15 M 
D) 0.29 M 
E) None of these choices is correct.

Question 19

The substance Ca(OH)2 is considered

Accepted Answer

A) a weak Arrhenius acid. 
B) a weak Arrhenius base. 
C) a strong Arrhenius acid. 
D) a strong Arrhenius base. 
E) a neutral compound. 
A) a weak Arrhenius acid. 
B) a weak Arrhenius base. 
C) a strong Arrhenius acid. 
D) a strong Arrhenius base. 
E) a neutral compound.

Question 20

Which of the following pairs has the stronger acid listed first?

Accepted Answer

A) H2AsO3,H2AsO4 
B) HI,HBr 
C) HClO,HClO3 
D) H2S,HCl 
E) H2SO3,H2SO4 
A) H2AsO3,H2AsO4 
B) HI,HBr 
C) HClO,HClO3 
D) H2S,HCl 
E) H2SO3,H2SO4

Exam 18: Acid-Base Equilibria

Select the pair of substances in which an acid is listed followed by its conjugate base.

Which one of the following is a Lewis acid but not a Brønsted-Lowry acid?

Calcium oxide,CaO,also known as quick lime,will react with carbon dioxide to form calcium carbonate,CaCO3.Which species,if any,acts as a Lewis acid in the reaction?

Formic acid,HCOOH,is a weak acid with a pKa of 3.74.Draw up a reaction table for the reaction of 0.300 M formic acid with water,and calculate the pH of this solution.

Consider the reaction: BF3 + F- →\to→ BF4- Can this ever be considered to be an acid-base reaction? Support your answer with appropriate arguments.

The pH of a 0.200 M solution of the weak base pyridine,C5H5N,is 8.59.Draw up a reaction table for the reaction of 0.200 M pyridine with water,and calculate Kb.

An aqueous solution is prepared by dissolving the salt formed by the neutralization of a weak acid by a weak base.Which statement about the solution is correct?

What is the pH of a 0.00200 M HClO4 solution?

Define an acid according to the Lewis theory.Write a balanced equation in support of this definition,in which the acid is neither an Arrhenius acid nor a Brønsted-Lowry acid.

Define a base according to the Brønsted-Lowry theory.Write a balanced equation in support of this definition,in which the base is acting as a Brønsted-Lowry base but not as an Arrhenius base.

The substance Ba(OH)2 is considered

What is the pOH of a 0.0085 M KOH solution?

A solution is prepared by adding 0.10 mol of lithium nitrate,LiNO3,to 1.00 L of water.Which statement about the solution is correct?

A solution is prepared by adding 0.10 mol of potassium chloride,KCl,to 1.00 L of water.Which statement about the solution is correct?

Which of the following liquids contains the strongest acid? 0.1 M HA,pH = 6.85 0.1 M HD,pH = 7.22 0.1 M HE,pH = 8.34 0.1 M HJ,pH = 11.88 Pure water

Which of the following is considered a Lewis acid?

Which of the following is the strongest base?

Picric acid has been used in the leather industry and in etching copper.However,its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive.It has an acid dissociation constant of 0.42.What is the [H3O+] for a 0.20 M solution of picric acid?

The substance Ca(OH)2 is considered

Which of the following pairs has the stronger acid listed first?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Calcium oxide,CaO,also known as quick lime,will react with carbon dioxide to form calcium carbonate,CaCO₃.Which species,if any,acts as a Lewis acid in the reaction?

Formic acid,HCOOH,is a weak acid with a pK_a of 3.74.Draw up a reaction table for the reaction of 0.300 M formic acid with water,and calculate the pH of this solution.

Consider the reaction: BF₃ + F^- $\to$ BF₄^- Can this ever be considered to be an acid-base reaction? Support your answer with appropriate arguments.

The pH of a 0.200 M solution of the weak base pyridine,C₅H₅N,is 8.59.Draw up a reaction table for the reaction of 0.200 M pyridine with water,and calculate K_b.

What is the pH of a 0.00200 M HClO₄ solution?

The substance Ba(OH)₂ is considered

A solution is prepared by adding 0.10 mol of lithium nitrate,LiNO₃,to 1.00 L of water.Which statement about the solution is correct?

Picric acid has been used in the leather industry and in etching copper.However,its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive.It has an acid dissociation constant of 0.42.What is the [H₃O⁺] for a 0.20 M solution of picric acid?

The substance Ca(OH)₂ is considered