Question 1

A 0.10 M aqueous solution of the weak base B at 25.0 °C has a pH of 8.00.The value of Kb for B is ________.

Accepted Answer

A) 1.0 × 10-15 
B) 1.0 × 10-11 
C) 1.0 × 10-6 
D) 1.0 × 10-12 
E) none of the above 
A) 1.0 × 10-15 
B) 1.0 × 10-11 
C) 1.0 × 10-6 
D) 1.0 × 10-12 
E) none of the above

Question 2

Calculate the pH of a 0.500 M aqueous solution of N   .The   of N   is

Accepted Answer

A) 8.95 
B) 11.47 
C) 2.53 
D) 11.77 
E) 2.23 
A) 8.95 
B) 11.47 
C) 2.53 
D) 11.77 
E) 2.23

Question 3

A 0.045 M solution of ammonia is 2.0% ionized at 25.0 °C.The Kb at 25.0 °C for ammonia is ________.

Accepted Answer

Question 4

Which of the following ions will act as a weak base in water?

Accepted Answer

A) OH- 
B) Cl- 
C) NO3- 
D) ClO- 
E) None of the above will act as a weak base in water. 
A) OH- 
B) Cl- 
C) NO3- 
D) ClO- 
E) None of the above will act as a weak base in water.

Question 5

Classify the following compounds as weak bases (W)or strong bases (S): ammonia fluoride ion sodium ion

Accepted Answer

A) S S S 
B) S W W 
C) W W W 
D) W S S 
E) W S W 
A) S S S 
B) S W W 
C) W W W 
D) W S S 
E) W S W

Question 6

Which one of the following is a Br∅nsted-Lowry base?

Accepted Answer

A) (CH3)3N 
B) CH3COOH 
C) HF 
D) HNO2 
E) none of the above 
A) (CH3)3N 
B) CH3COOH 
C) HF 
D) HNO2 
E) none of the above

Question 7

According to the Arrhenius concept,an acid is a substance that ________.

Accepted Answer

A) is capable of donating one or more H+ 
B) causes an increase in the concentration of H+ in aqueous solutions 
C) can accept a pair of electrons to form a coordinate covalent bond 
D) reacts with the solvent to form the cation formed by autoionization of that solvent 
E) tastes bitter 
A) is capable of donating one or more H+ 
B) causes an increase in the concentration of H+ in aqueous solutions 
C) can accept a pair of electrons to form a coordinate covalent bond 
D) reacts with the solvent to form the cation formed by autoionization of that solvent 
E) tastes bitter

Question 8

Which of the following salts will produce an acidic solution?

Accepted Answer

A) Sr(ClO4)2 
B) KBr 
C) NH4I 
D) K2CO3 
E) NaNO3 
A) Sr(ClO4)2 
B) KBr 
C) NH4I 
D) K2CO3 
E) NaNO3

Question 9

Classify the following compounds as weak bases (W)or strong bases (S): methylamine carbonate ion potassium ion

Accepted Answer

A) S S S 
B) S W W 
C) W S S 
D) W W W 
E) W S W 
A) S S S 
B) S W W 
C) W S S 
D) W W W 
E) W S W

Question 10

What is the conjugate acid of NH2-?

Accepted Answer

A) NH2+ 
B) NH3+ 
C) NH4+ 
D) NH3 
E) NH4OH 
A) NH2+ 
B) NH3+ 
C) NH4+ 
D) NH3 
E) NH4OH

Question 11

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO)is 3.0 ×   .At equilibrium,the molarity of   in a 0.066 M solution of HClO is ________.

Accepted Answer

A) 4.4 ×   
B) 0.066 
C) 2.2 ×   
D) 4.35 
E) 1.18 
A) 4.4 ×   
B) 0.066 
C) 2.2 ×   
D) 4.35 
E) 1.18

Question 12

What is the pOH of an aqueous solution at 25.0 °C that contains 2.50 × 10-4 M hydronium ion?

Accepted Answer

A) 3.60 
B) 4.00 
C) 2.50 
D) 10.4 
E) 7.00 
A) 3.60 
B) 4.00 
C) 2.50 
D) 10.4 
E) 7.00

Question 13

An aqueous basic solution has a concentration of 0.050 M and Kb is 4.4 × 10-4.What is the concentration of hydroxide ion in this solution (M)?

Accepted Answer

A) 2.2 × 10-5 
B) 4.5 × 10-3 
C) 2.9 × 10-3 
D) 4.7 × 10-3 
E) 0.050 
A) 2.2 × 10-5 
B) 4.5 × 10-3 
C) 2.9 × 10-3 
D) 4.7 × 10-3 
E) 0.050

Question 14

Calculate the pH of a solution at 25.0 °C that contains 2.95 × 10-12 M hydronium ions.

Accepted Answer

A) 2.95 
B) 11.53 
C) 7.00 
D) 12.00 
E) 2.47 
A) 2.95 
B) 11.53 
C) 7.00 
D) 12.00 
E) 2.47

Question 15

The   for   is   What is the pOH of a 0.0727 M aqueous NaA solution at 25.0 °C?

Accepted Answer

A) 9.33 
B) 5.22 
C) 8.78 
D) 1.14 
E) 10.00 
A) 9.33 
B) 5.22 
C) 8.78 
D) 1.14 
E) 10.00

Question 16

A 0.5 M solution of ________ has a pH of 7.0.

Accepted Answer

A) K2S 
B) KF 
C) KNO3 
D) NH4Br 
E) NaF 
A) K2S 
B) KF 
C) KNO3 
D) NH4Br 
E) NaF

Question 17

A Lewis acid is an electron-pair acceptor,and a Lewis base is an electron-pair donor.

Accepted Answer

A) True 
 B)False

Question 18

An acid containing the COOH group is called a carbo-oxy acid.

Accepted Answer

A) True 
 B)False

Question 19

The conjugate base of H2PO4- is ________.

Accepted Answer

A) H3PO4 
B) HPO42- 
C) PO43- 
D) H3O+ 
E) OH- 
A) H3PO4 
B) HPO42- 
C) PO43- 
D) H3O+ 
E) OH-

Question 20

Which solution below has the highest concentration of hydronium ions?

Accepted Answer

A) pH = 3.0 
B) pH = 10 
C) pH = 7.0 
D) pH = 6.4 
E) pH = 11.2 
A) pH = 3.0 
B) pH = 10 
C) pH = 7.0 
D) pH = 6.4 
E) pH = 11.2

Exam 16: Acid-Base Equilibria

A 0.10 M aqueous solution of the weak base B at 25.0 °C has a pH of 8.00.The value of Kb for B is ________.

Calculate the pH of a 0.500 M aqueous solution of N .The of N is

A 0.045 M solution of ammonia is 2.0% ionized at 25.0 °C.The Kb at 25.0 °C for ammonia is ________.

Which of the following ions will act as a weak base in water?

Classify the following compounds as weak bases (W)or strong bases (S): ammonia fluoride ion sodium ion

Which one of the following is a Br∅nsted-Lowry base?

According to the Arrhenius concept,an acid is a substance that ________.

Which of the following salts will produce an acidic solution?

Classify the following compounds as weak bases (W)or strong bases (S): methylamine carbonate ion potassium ion

What is the conjugate acid of NH2-?

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO)is 3.0 × .At equilibrium,the molarity of in a 0.066 M solution of HClO is ________.

What is the pOH of an aqueous solution at 25.0 °C that contains 2.50 × 10-4 M hydronium ion?

An aqueous basic solution has a concentration of 0.050 M and Kb is 4.4 × 10-4.What is the concentration of hydroxide ion in this solution (M)?

Calculate the pH of a solution at 25.0 °C that contains 2.95 × 10-12 M hydronium ions.

The for is What is the pOH of a 0.0727 M aqueous NaA solution at 25.0 °C?

A 0.5 M solution of ________ has a pH of 7.0.

A Lewis acid is an electron-pair acceptor,and a Lewis base is an electron-pair donor.

An acid containing the COOH group is called a carbo-oxy acid.

The conjugate base of H2PO4- is ________.

Which solution below has the highest concentration of hydronium ions?

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

A 0.10 M aqueous solution of the weak base B at 25.0 °C has a pH of 8.00.The value of K_b for B is ________.

A 0.045 M solution of ammonia is 2.0% ionized at 25.0 °C.The K_b at 25.0 °C for ammonia is ________.

What is the conjugate acid of NH₂^-?

What is the pOH of an aqueous solution at 25.0 °C that contains 2.50 × 10^-4 M hydronium ion?

An aqueous basic solution has a concentration of 0.050 M and K_b is 4.4 × 10^-4.What is the concentration of hydroxide ion in this solution (M)?

Calculate the pH of a solution at 25.0 °C that contains 2.95 × 10^-12 M hydronium ions.

The conjugate base of H₂PO₄^- is ________.