Question 1

The first ionization constant Ka1 is always smaller than the second ionization constant Ka2 for the ionization of a diprotic acid.

Accepted Answer

A) True 
 B)False

Question 2

Since zirconium is a metal,ZrO2 is expected to be a/an _____ oxide.

Accepted Answer

A) acidic 
B) ionic 
C) amphoteric 
D) neutral 
E) basic 
A) acidic 
B) ionic 
C) amphoteric 
D) neutral 
E) basic

Question 3

Amphoteric oxides exhibit both acidic and basic properties.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is the correct Kb expression for the reaction below? B(aq)+ H2O (l)   HB+(aq)+ OH-(aq)

Accepted Answer

A) Kb = [B][ H2O] 
B)    
C)    
D)    
E) Kb = [HB+][OH-] 
A) Kb = [B][ H2O] 
B)    
C)    
D)    
E) Kb = [HB+][OH-]

Question 5

Calculate the concentration of malonate ion (C3H2O42-)in a 0.200 M solution of malonic acid (C3H4O4).(For malonic acid,Ka1 = 1.4 × 10-3,Ka2 = 2.0 × 10-6.)

Accepted Answer

A) 2.8 × 10-4 M 
B) 0.016 M 
C) 1.8 × 10-4 M 
D) 1.4 × 10-3 M 
E) 2.0 × 10-6 M 
A) 2.8 × 10-4 M 
B) 0.016 M 
C) 1.8 × 10-4 M 
D) 1.4 × 10-3 M 
E) 2.0 × 10-6 M

Question 6

Acid strength decreases in the series HI > HSO4-> HF > HCN.Which of these anions is the weakest base?

Accepted Answer

A) I- 
B) SO42- 
C) F- 
D) CN- 
A) I- 
B) SO42- 
C) F- 
D) CN-

Question 7

Below is a representation of pure liquid HX,an amphoteric substance,at equilibrium.(Each circle represents 1.0 ×10-3 mol of atoms,and the volume of the box is 1.0 L.)   What is the autoionization constant for HX?

Accepted Answer

A) 4.9 ×10-2 
B) 4.0 ×10-3 
C) 4.4 ×10-4 
D) 4.0 ×10-6 
E) 2.5 ×105 
A) 4.9 ×10-2 
B) 4.0 ×10-3 
C) 4.4 ×10-4 
D) 4.0 ×10-6 
E) 2.5 ×105

Question 8

Equal volumes of two solutions,one containing a strong acid at pH 2 and the other containing a strong base at pH 12,are mixed.Once equilibrium is achieved,what is the final pH of the combined solution?

Accepted Answer

A) 6 
B) 7 
C) 10 
D) 14 
E) 24 
A) 6 
B) 7 
C) 10 
D) 14 
E) 24

Question 9

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

Accepted Answer

A) 8.23 × 10-2 M 
B) 1.22 × 10-6 M 
C) 8.23 × 10-12 M 
D) 1.22 × 10-13 M 
E) 8.23 × 10-16 M 
A) 8.23 × 10-2 M 
B) 1.22 × 10-6 M 
C) 8.23 × 10-12 M 
D) 1.22 × 10-13 M 
E) 8.23 × 10-16 M

Question 10

The most basic oxides are formed from elements found in the __________________ region of the periodic table.

Accepted Answer

A) upper right 
B) upper left 
C) center 
D) lower right 
E) lower left 
A) upper right 
B) upper left 
C) center 
D) lower right 
E) lower left

Question 11

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) 0.20 M 
E) 0.29 M 
A) 0.022 M 
B) 0.052 M 
C) 0.15 M 
D) 0.20 M 
E) 0.29 M

Question 12

Which is a Lewis acid but not a Brønsted acid?

Accepted Answer

A) HCN 
B) CO32- 
C) OH- 
D) Cl- 
E) Al3+ 
A) HCN 
B) CO32- 
C) OH- 
D) Cl- 
E) Al3+

Question 13

The following is the correct order for the acid strength for these oxoacids.HClO > HClO2 > HClO3> HClO4

Accepted Answer

A) True 
 B)False

Question 14

Calculate the pH of a 0.021 M NaCN solution.[Ka(HCN)= 4.9 × 10-10]

Accepted Answer

A) 1.68 
B) 3.19 
C) 4.69 
D) 9.31 
E) 10.81 
A) 1.68 
B) 3.19 
C) 4.69 
D) 9.31 
E) 10.81

Question 15

A solution of sodium acetate (CH3COONa)in water is weakly basic.

Accepted Answer

A) True 
 B)False

Question 16

A 0.15 M solution of chloroacetic acid has a pH of 1.86.What is the value of Ka for this acid?

Accepted Answer

A) 7.2 × 101 
B) 1.6 × 10-1 
C) 9.9 × 10-2 
D) 1.4 × 10-3 
E) 2.7 × 10-4 
A) 7.2 × 101 
B) 1.6 × 10-1 
C) 9.9 × 10-2 
D) 1.4 × 10-3 
E) 2.7 × 10-4

Question 17

Which is an acidic oxide?

Accepted Answer

A) P4O10 
B) MgO 
C) Fe2O3 
D) K2O 
E) Cr2O3 
A) P4O10 
B) MgO 
C) Fe2O3 
D) K2O 
E) Cr2O3

Question 18

Which is a basic oxide?

Accepted Answer

A) CO2 
B) MgO 
C) As2O3 
D) SO2 
E) Cl2O7 
A) CO2 
B) MgO 
C) As2O3 
D) SO2 
E) Cl2O7

Question 19

What is the conjugate base of NH3?

Accepted Answer

A) NH2 
B) NH2+ 
C) NH2- 
D) NH4 
E) NH4+ 
A) NH2 
B) NH2+ 
C) NH2- 
D) NH4 
E) NH4+

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 16: Acids and Bases

The first ionization constant Ka1 is always smaller than the second ionization constant Ka2 for the ionization of a diprotic acid.

Since zirconium is a metal,ZrO2 is expected to be a/an _____ oxide.

Amphoteric oxides exhibit both acidic and basic properties.

Which of the following is the correct Kb expression for the reaction below? B(aq)+ H2O (l) HB+(aq)+ OH-(aq)

Calculate the concentration of malonate ion (C3H2O42-)in a 0.200 M solution of malonic acid (C3H4O4).(For malonic acid,Ka1 = 1.4 × 10-3,Ka2 = 2.0 × 10-6.)

Acid strength decreases in the series HI > HSO4-> HF > HCN.Which of these anions is the weakest base?

Below is a representation of pure liquid HX,an amphoteric substance,at equilibrium.(Each circle represents 1.0 ×10-3 mol of atoms,and the volume of the box is 1.0 L.) What is the autoionization constant for HX?

Equal volumes of two solutions,one containing a strong acid at pH 2 and the other containing a strong base at pH 12,are mixed.Once equilibrium is achieved,what is the final pH of the combined solution?

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

The most basic oxides are formed from elements found in the __________________ region of the periodic table.

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?

Which is a Lewis acid but not a Brønsted acid?

The following is the correct order for the acid strength for these oxoacids.HClO > HClO2 > HClO3> HClO4

Calculate the pH of a 0.021 M NaCN solution.[Ka(HCN)= 4.9 × 10-10]

A solution of sodium acetate (CH3COONa)in water is weakly basic.

A 0.15 M solution of chloroacetic acid has a pH of 1.86.What is the value of Ka for this acid?

Which is an acidic oxide?

Which is a basic oxide?

What is the conjugate base of NH3?

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

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The first ionization constant K_a1 is always smaller than the second ionization constant K_a2 for the ionization of a diprotic acid.

Since zirconium is a metal,ZrO₂ is expected to be a/an _____ oxide.

Which of the following is the correct Kb expression for the reaction below? B(aq)+ H₂O (l) HB+(aq)+ OH^-(aq)

Calculate the concentration of malonate ion (C₃H₂O₄²^-)in a 0.200 M solution of malonic acid (C₃H₄O₄).(For malonic acid,K_a1 = 1.4 × 10^-³,K_a2 = 2.0 × 10^-⁶.)

Acid strength decreases in the series HI > HSO₄^-> HF > HCN.Which of these anions is the weakest base?

Below is a representation of pure liquid HX,an amphoteric substance,at equilibrium.(Each circle represents 1.0 ×10^-³ mol of atoms,and the volume of the box is 1.0 L.) What is the autoionization constant for HX?

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

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 following is the correct order for the acid strength for these oxoacids.HClO > HClO₂ > HClO₃> HClO₄

Calculate the pH of a 0.021 M NaCN solution.[Ka(HCN)= 4.9 × 10^-¹⁰]

A solution of sodium acetate (CH₃COONa)in water is weakly basic.

A 0.15 M solution of chloroacetic acid has a pH of 1.86.What is the value of K_a for this acid?

What is the conjugate base of NH₃?

The ammonium ion,NH₄⁺,is a weak acid.