Question 1

The substance NaNO3 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. E

Question 2

Kw = 1.0 $\times$ 10-14,regardless of temperature.

Accepted Answer

A) True 
 B)False  False

Question 3

What is the pH of a 0.050 M triethylamine, (C2H5)3N,solution?
Kb for triethylamine is 5.3 $\times$ 10-4.

Accepted Answer

A) 11.69 
B) 8.68 
C) 5.32 
D) 2.31 
E) < 2.0 
A) 11.69 
B) 8.68 
C) 5.32 
D) 2.31 
E) < 2.0 A

Question 4

The ammonium ion,NH4+,is a weak acid.

Accepted Answer

A) True 
 B)False

Question 5

A solution is prepared by adding 0.10 mol of potassium acetate,KCH3COO,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) The concentrations of potassium ions and acetate ions will be identical. 
E) The concentration of acetate ions will be greater than the concentration of potassium ions. 
A) The solution is basic. 
B) The solution is neutral. 
C) The solution is acidic. 
D) The concentrations of potassium ions and acetate ions will be identical. 
E) The concentration of acetate ions will be greater than the concentration of potassium ions.

Question 6

All strong acids have weak conjugate bases.

Accepted Answer

A) True 
 B)False

Question 7

Which,if any,of the following acids is strong?

Accepted Answer

A) phosphoric 
B) carbonic 
C) acetic 
D) water 
E) None of these choices is correct. 
A) phosphoric 
B) carbonic 
C) acetic 
D) water 
E) None of these choices is correct.

Question 8

Butyric acid is responsible for the odor in rancid butter.A solution of 0.25 M butyric acid has a pH of 2.71.What is the Ka for the acid?

Accepted Answer

A) 0.36 
B) 2.4 $\times$ 10-2 
C) 7.8 $\times$ 10-3 
D) 1.5 $\times$ 10-5 
E) None of these choices is correct. 
A) 0.36 
B) 2.4 $\times$ 10-2 
C) 7.8 $\times$ 10-3 
D) 1.5 $\times$ 10-5 
E) None of these choices is correct.

Question 9

A solution is prepared by adding 0.10 mol of iron(III)nitrate,Fe(NO3)3,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) The value of Ka for the species in solution must be known before a prediction can be made. 
E) The value of 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) The value of Ka for the species in solution must be known before a prediction can be made. 
E) The value of Kb for the species in solution must be known before a prediction can be made.

Question 10

Arrhenius bases raise the hydroxide ion concentration when dissolved in water.

Accepted Answer

A) True 
 B)False

Question 11

The chloride ion,Cl-,is a typical Lewis acid.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is the strongest acid?

Accepted Answer

A) CH3COOH 
B) HF 
C) H3PO4 
D) H2SO3 
E) HI 
A) CH3COOH 
B) HF 
C) H3PO4 
D) H2SO3 
E) HI

Question 13

What is the [OH-] for a solution at 25°C that has [H3O+] = 8.23 $\times$ 10-2 M?

Accepted Answer

A)  > 10-5 M 
B) 1.22 $\times$ 10-6 M 
C) 8.23 $\times$ 10-12 M 
D) 1.22 $\times$ 10-13 M 
E) 8.23 $\times$ 10-16 M 
A)  > 10-5 M 
B) 1.22 $\times$ 10-6 M 
C) 8.23 $\times$ 10-12 M 
D) 1.22 $\times$ 10-13 M 
E) 8.23 $\times$ 10-16 M

Question 14

Which of the following acids has the lowest pH?
0.1 M HBO,pKa = 2.43
0.1 M HA,pKa = 4.55
0.1 M HMO,pKa = 8.23
0.1 M HST,pKa = 11.89
Pure water

Accepted Answer

A) HA 
B) HST 
C) HMO 
D) HBO 
E) pure water 
A) HA 
B) HST 
C) HMO 
D) HBO 
E) pure water

Question 15

A 1.25 M solution of the weak acid HA is 9.2% dissociated.What is the pH of the solution?

Accepted Answer

A) 0.64 
B) 0.94 
C) 1.13 
D) 2.16 
E) None of these choices is correct. 
A) 0.64 
B) 0.94 
C) 1.13 
D) 2.16 
E) None of these choices is correct.

Question 16

Which one of the following is a strong acid?

Accepted Answer

A) H2CO3 
B) H2SO3 
C) H2SO4 
D) H3PO4 
E) CH3COOH 
A) H2CO3 
B) H2SO3 
C) H2SO4 
D) H3PO4 
E) CH3COOH

Question 17

All Brønsted-Lowry bases have at least one lone pair of electrons.

Accepted Answer

A) True 
 B)False

Question 18

The substance NH3 is considered

Accepted Answer

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

Question 19

Iodine trichloride,ICl3,will react with a chloride ion to form ICl4-.Which species,if any,acts as a Lewis acid this reaction?

Accepted Answer

A) ICl4- 
B) ICl 3 
C) Cl- 
D) the solvent 
E) None of the species acts as a Lewis acid in this reaction. 
A) ICl4- 
B) ICl 3 
C) Cl- 
D) the solvent 
E) None of the species acts as a Lewis acid in this reaction.

Question 20

Select the pair of substances which is not a conjugate acid-base pair.

Accepted Answer

A) H3O+,H2O 
B) HNO2,NO2- 
C) H2SO4,HSO4- 
D) H2S,S2- 
E) NH3,NH2- 
A) H3O+,H2O 
B) HNO2,NO2- 
C) H2SO4,HSO4- 
D) H2S,S2- 
E) NH3,NH2-

Exam 18: Acid-Base Equilibria

The substance NaNO3 is considered

Kw = 1.0 ×\times× 10-14,regardless of temperature.

What is the pH of a 0.050 M triethylamine, (C2H5)3N,solution? Kb for triethylamine is 5.3 ×\times× 10-4.

The ammonium ion,NH4+,is a weak acid.

A solution is prepared by adding 0.10 mol of potassium acetate,KCH3COO,to 1.00 L of water.Which statement about the solution is correct?

All strong acids have weak conjugate bases.

Which,if any,of the following acids is strong?

Butyric acid is responsible for the odor in rancid butter.A solution of 0.25 M butyric acid has a pH of 2.71.What is the Ka for the acid?

A solution is prepared by adding 0.10 mol of iron(III)nitrate,Fe(NO3)3,to 1.00 L of water.Which statement about the solution is correct?

Arrhenius bases raise the hydroxide ion concentration when dissolved in water.

The chloride ion,Cl-,is a typical Lewis acid.

Which of the following is the strongest acid?

What is the [OH-] for a solution at 25°C that has [H3O+] = 8.23 ×\times× 10-2 M?

Which of the following acids has the lowest pH? 0.1 M HBO,pKa = 2.43 0.1 M HA,pKa = 4.55 0.1 M HMO,pKa = 8.23 0.1 M HST,pKa = 11.89 Pure water

A 1.25 M solution of the weak acid HA is 9.2% dissociated.What is the pH of the solution?

Which one of the following is a strong acid?

All Brønsted-Lowry bases have at least one lone pair of electrons.

The substance NH3 is considered

Iodine trichloride,ICl3,will react with a chloride ion to form ICl4-.Which species,if any,acts as a Lewis acid this reaction?

Select the pair of substances which is not a conjugate acid-base pair.

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

The substance NaNO₃ is considered

K_w = 1.0 $\times$ 10^-14,regardless of temperature.

What is the pH of a 0.050 M triethylamine, (C₂H₅)₃N,solution? K_b for triethylamine is 5.3 $\times$ 10^-4.

The ammonium ion,NH₄⁺,is a weak acid.

A solution is prepared by adding 0.10 mol of potassium acetate,KCH₃COO,to 1.00 L of water.Which statement about the solution is correct?

Butyric acid is responsible for the odor in rancid butter.A solution of 0.25 M butyric acid has a pH of 2.71.What is the K_a for the acid?

A solution is prepared by adding 0.10 mol of iron(III)nitrate,Fe(NO₃)₃,to 1.00 L of water.Which statement about the solution is correct?

The chloride ion,Cl^-,is a typical Lewis acid.

What is the [OH^-] for a solution at 25°C that has [H₃O⁺] = 8.23 $\times$ 10^-2 M?

Which of the following acids has the lowest pH? 0.1 M HBO,pK_a = 2.43 0.1 M HA,pK_a = 4.55 0.1 M HMO,pK_a = 8.23 0.1 M HST,pK_a = 11.89 Pure water

The substance NH₃ is considered

Iodine trichloride,ICl₃,will react with a chloride ion to form ICl₄^-.Which species,if any,acts as a Lewis acid this reaction?