Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

Which is a basic oxide?

Accepted Answer

A)  CO2
B)  MgO
C)  As2O3
D)  SO2
E)  Cl2O7F) A) and D)
G) A) and B)

Question 4

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 MF) D) and E)
G) B) and E)

Question 5

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.)  -3 mol of atoms,and the volume of the box is 1.0 L.)    What is the autoionization constant for HX? A) 4.9 ×10-2 B) 4.0 ×10-3 C) 4.4 ×10-4 D) 4.0 ×10-6 E) 2.5 ×105" class="answers-bank-image d-inline" rel="preload" > 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 ×105F) A) and D)
G) None of the above

Question 6

Which is a Lewis acid but not a Brønsted acid?

Accepted Answer

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

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

Amphoteric oxides exhibit both acidic and basic properties.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A)  acidic
B)  ionic
C)  amphoteric
D)  neutral
E)  basicF) A) and B)
G) All of the above

Question 10

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 MF) A) and B)
G) A) and E)

Question 11

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 MF) None of the above
G) B) and E)

Question 12

Which of the following is the correct Kb expression for the reaction below? B(aq) + H2O (l)  2O (l)    HB+(aq) + OH-(aq)  A) Kb = [B][ H2O] B)    C)    D)    E) Kb = [HB+][OH-]" class="answers-bank-image d-inline" rel="preload" > HB+(aq) + OH-(aq)

Accepted Answer

A)  Kb = [B][ H2O]
B)   2O (l)    HB+(aq) + OH-(aq)  
A)  Kb = [B][ H2O] 
B)     
C)     
D)     
E)  Kb = [HB+][OH-]" class="answers-bank-image d-inline" rel="preload" >
C)   2O (l)    HB+(aq) + OH-(aq)  
A)  Kb = [B][ H2O] 
B)     
C)     
D)     
E)  Kb = [HB+][OH-]" class="answers-bank-image d-inline" rel="preload" >
D)   2O (l)    HB+(aq) + OH-(aq)  
A)  Kb = [B][ H2O] 
B)     
C)     
D)     
E)  Kb = [HB+][OH-]" class="answers-bank-image d-inline" rel="preload" >
E)  Kb = [HB+][OH-]F) C) and D)
G) B) and C)

Question 13

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 leftF) A) and D)
G) B) and E)

Question 14

Which is an acidic oxide?

Accepted Answer

A)  P4O10
B)  MgO
C)  Fe2O3
D)  K2O
E)  Cr2O3F) All of the above
G) A) and B)

Question 15

What is the conjugate base of NH3?

Accepted Answer

A)  NH2
B)  NH2+
C)  NH2-
D)  NH4
E)  NH4+F) None of the above
G) B) and D)

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 × 10-4F) B) and D)
G) B) and C)

Question 17

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)  10.81F) A) and E)
G) A) and D)

Question 18

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-E) A) and B)
F) B) and C)

Question 19

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)  24F) B) and C)
G) D) and E)

Question 20

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

Exam 16: Acids and Bases

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

What is the conjugate base of NH3?

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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?

Correct AnswerverifiedShow Answer

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.)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is a basic oxide?

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Amphoteric oxides exhibit both acidic and basic properties.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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Which is an acidic oxide?

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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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is a Lewis acid but not a Brønsted acid?

Correct AnswerverifiedShow Answer

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

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

Correct Answer
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What is the conjugate base of NH₃?

Correct Answer
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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?

Correct Answer
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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.)

Correct Answer
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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.

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

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

Correct Answer
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Correct Answer
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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?

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

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

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

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

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

Correct Answer
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Correct Answer
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