Question 1

Which is a basic oxide?

Accepted Answer

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

Question 2

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) B) and E)
G) C) and E)

Question 3

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) None of the above
G) A) and D)

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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) A) and E)
G) C) and D)

Question 6

Which is an acidic oxide?

Accepted Answer

A)  P4O10
B)  MgO
C)  Fe2O3
D)  K2O
E)  Cr2O3F) C) and E)
G) B) and C)

Question 7

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

Question 8

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) A) and E)
G) D) and E)

Question 9

Amphoteric oxides exhibit both acidic and basic properties.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

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 MF) C) and D)
G) A) and D)

Question 12

Which is a Lewis acid but not a Brønsted acid?

Accepted Answer

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

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 B)
G) All of the above

Question 14

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

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) All of the above

Question 16

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

Question 17

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 18

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

Accepted Answer

A) True 
 B)False

Question 19

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) None of the above

Question 20

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) A) and E)
G) C) and E)

Exam 16: Acids and Bases

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

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Which is a Lewis acid but not a Brønsted acid?

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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.)

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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?

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

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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?

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

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Which is an acidic oxide?

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

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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?

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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)

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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

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

Correct AnswerverifiedShow Answer

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

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Amphoteric oxides exhibit both acidic and basic properties.

Correct AnswerverifiedShow Answer

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

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

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What is the conjugate base of NH3?

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Which is a basic oxide?

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

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

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

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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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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The ammonium ion,NH₄⁺,is a weak acid.

Correct Answer
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What is the conjugate base of NH₃?

Correct Answer
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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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