Question 1

Measurements show that the [OH - ] of a solution is 6.02×10 - 6 M. The pH of this solution is:

Accepted Answer

A)  8.78 
B)  5.22 
C)  6.02 
D)  9.78 
E)  none of these 
A)  8.78 
B)  5.22 
C)  6.02 
D)  9.78 
E)  none of these

Question 2

Consider the following unfinished table of weak acids with their corresponding p K a values and K a values. Weak Acid p K a K a Benzoic acid 4.20 -- Lactic acid -- 1.4×10 - 4 Chlorous acid 1.96 -- Arrange these three acids in order of increasing acid strength .

Accepted Answer

A)  (weakest) Benzoic acid < Lactic acid < Chlorous acid (strongest) 
B)  (weakest) Benzoic acid < Chlorous acid < Lactic acid (strongest) 
C)  (weakest) Lactic acid < Benzoic acid < Chlorous acid (strongest) 
D)  (weakest) Lactic acid < Chlorous acid < Benzoic acid (strongest) 
E)  (weakest) Chlorous acid < Benzoic acid < Lactic acid (strongest) 
A)  (weakest) Benzoic acid < Lactic acid < Chlorous acid (strongest) 
B)  (weakest) Benzoic acid < Chlorous acid < Lactic acid (strongest) 
C)  (weakest) Lactic acid < Benzoic acid < Chlorous acid (strongest) 
D)  (weakest) Lactic acid < Chlorous acid < Benzoic acid (strongest) 
E)  (weakest) Chlorous acid < Benzoic acid < Lactic acid (strongest)

Question 3

Exhibit 15-5 Consider solving for the pH of a 0.300 M aqueous solution of KCN to answer the following question(s).
-Refer to Exhibit 15-5. What is the [OH - ] ion concentration in this 0.300 M KCN aqueous solution?

Accepted Answer

A)  [OH - ] = 1.4×10 - 12 M 
B)  [OH - ] = 2.3×10 - 11 M 
C)  [OH - ] = 2.2×10 - 3 M 
D)  [OH - ] = 0.300 M 
E)  [OH - ] = 1.4×102 M 
A)  [OH - ] = 1.4×10 - 12 M 
B)  [OH - ] = 2.3×10 - 11 M 
C)  [OH - ] = 2.2×10 - 3 M 
D)  [OH - ] = 0.300 M 
E)  [OH - ] = 1.4×102 M

Question 4

What species are formed in the hydrolysis reaction of KCN with water?
KCN + H₂ O   ??

Accepted Answer

A)  H3O+ + KH + CN -  
B)  HCN + KOH 
C)  H2 + K2O + CN -  
D)  H3O+ + CN -  
E)  KH + H2O + CN -  
A)  H3O+ + KH + CN -  
B)  HCN + KOH 
C)  H2 + K2O + CN -  
D)  H3O+ + CN -  
E)  KH + H2O + CN -

Question 5

Identify the Lewis acid in the following reaction. CO2 + H2O→H2CO3

Accepted Answer

A)  CO2 
B)  H2O 
C)  H2CO3 
D)  H3O+ 
A)  CO2 
B)  H2O 
C)  H2CO3 
D)  H3O+

Question 6

What is the conjugate acid of the species H2BO31 - ?

Accepted Answer

A)  H3BO3 
B)  H3BO32 -  
C)  H3O+ 
D)  HBO32 -  
E)  HBO3 
A)  H3BO3 
B)  H3BO32 -  
C)  H3O+ 
D)  HBO32 -  
E)  HBO3

Question 7

The pH of a solution is 5. The [H3O+] and [OH - ] are:

Accepted Answer

A)  10 - 5 and 10 - 7 M, respectively. 
B)  10 - 5 and 10 - 9 M, respectively. 
C)  10 - 9 and 10 - 7 M, respectively. 
D)  10 - 9 and 10 - 5 M, respectively. 
E)  none of these 
A)  10 - 5 and 10 - 7 M, respectively. 
B)  10 - 5 and 10 - 9 M, respectively. 
C)  10 - 9 and 10 - 7 M, respectively. 
D)  10 - 9 and 10 - 5 M, respectively. 
E)  none of these

Question 8

Consider the changes in acid strengths in the series HClO, HClO2, HClO3, and HClO4.

Accepted Answer

A)  The strengths of the acids increase because the resulting anion is more stable with more oxygens. 
B)  The strengths of the acids decrease because the larger number of oxygens increase hydrogen bonding. 
C)  The strengths of the acids increase because the acids become less binary. 
D)  The strengths of the acids decrease. 
A)  The strengths of the acids increase because the resulting anion is more stable with more oxygens. 
B)  The strengths of the acids decrease because the larger number of oxygens increase hydrogen bonding. 
C)  The strengths of the acids increase because the acids become less binary. 
D)  The strengths of the acids decrease.

Question 9

What is the pH of 2.0 liters of aqueous solution that contains 9.0 grams of HCl?

Accepted Answer

A)  0.12 
B)  0.660 
C)  0.810 
D)  0.90 
E)  13.10 
A)  0.12 
B)  0.660 
C)  0.810 
D)  0.90 
E)  13.10

Question 10

Exhibit 15-2 The pH of a solution of a certain brand of Cola is 2.27. Use this information to solve the following problem(s).
Refer to Exhibit 15-2. What is the hydroxide ion concentration, [OH - ], of this solution?

Accepted Answer

A)  9.68×10 - 14 M 
B)  1.86×10 - 12 M 
C)  5.37×10 - 3 M 
D)  1.03×10 - 1 M 
E)  5.37×1011 M 
A)  9.68×10 - 14 M 
B)  1.86×10 - 12 M 
C)  5.37×10 - 3 M 
D)  1.03×10 - 1 M 
E)  5.37×1011 M

Question 11

A water soluble salt composed of the anion of a weak acid and the cation of a strong base is dissolved in pure water. The resulting solution:

Accepted Answer

A)  is neutral. 
B)  has a pH greater than 7. 
C)  is acidic. 
D)  has a very low pH. 
E)  more than one of these is correct. 
A)  is neutral. 
B)  has a pH greater than 7. 
C)  is acidic. 
D)  has a very low pH. 
E)  more than one of these is correct.

Question 12

Which of the following substances would be the strongest acid?

Accepted Answer

A)  NH4Br 
B)  HBrO4 
C)  HBrO3 
D)  NaOH 
E)  CH3COOH 
A)  NH4Br 
B)  HBrO4 
C)  HBrO3 
D)  NaOH 
E)  CH3COOH

Question 13

Benzoic acid is weak with K a = 6.3×10 - 5. What fraction ionizes in a 0.050 M solution?

Accepted Answer

A)  1.8×10 - 3% 
B)  0.13% 
C)  0.35% 
D)  1.3% 
E)  3.5% 
A)  1.8×10 - 3% 
B)  0.13% 
C)  0.35% 
D)  1.3% 
E)  3.5%

Question 14

Which of the following solutions will not be basic?

Accepted Answer

A)  A solution of NaOH. 
B)  A solution of a weak base. 
C)  A solution of the chloride of the conjugate acid of a weak base. 
D)  A solution of the sodium salt of the conjugate base of a weak acid. 
E)  A solution of a strong base. 
A)  A solution of NaOH. 
B)  A solution of a weak base. 
C)  A solution of the chloride of the conjugate acid of a weak base. 
D)  A solution of the sodium salt of the conjugate base of a weak acid. 
E)  A solution of a strong base.

Question 15

What is the conjugate acid of the species, HAsO42 - ?

Accepted Answer

A)  H3O+ 
B)  H3AsO4 
C)  H2AsO41 -  
D)  H2AsO43 -  
E)  AsO43 -  
A)  H3O+ 
B)  H3AsO4 
C)  H2AsO41 -  
D)  H2AsO43 -  
E)  AsO43 -

Question 16

Which species listed below is the conjugate base of NH3?

Accepted Answer

A)  NH4+ 
B)  NH4 
C)  NH21+ 
D)  NH21 -  
E)  OH -  
A)  NH4+ 
B)  NH4 
C)  NH21+ 
D)  NH21 -  
E)  OH -

Question 17

Exhibit 15-1 The pH of a certain brand of milk is 6.60. Use this information to answer the following question(s).
-Refer to Exhibit 15-1. What is the molar concentration of hydroxide ion , [OH - ], in this milk?

Accepted Answer

A)  2.5×10 - 21 M 
B)  1.2×10 - 14 M 
C)  1.5×10 - 14 M 
D)  1.7×10 - 9 M 
E)  4.0×10 - 8 M 
A)  2.5×10 - 21 M 
B)  1.2×10 - 14 M 
C)  1.5×10 - 14 M 
D)  1.7×10 - 9 M 
E)  4.0×10 - 8 M

Question 18

Exhibit 15-1 The pH of a certain brand of milk is 6.60. Use this information to answer the following question(s).
-Refer to Exhibit 15-1. What is the molar concentration of the hydronium ion , [H3O+], in this milk?

Accepted Answer

A)  2.5×10 - 7 M 
B)  6.0×10 - 6 M 
C)  6.6×10 - 1 M 
D)  8.2×10 - 1 M 
E)  4.0×106 M 
A)  2.5×10 - 7 M 
B)  6.0×10 - 6 M 
C)  6.6×10 - 1 M 
D)  8.2×10 - 1 M 
E)  4.0×106 M

Question 19

Exhibit 15-5 Consider solving for the pH of a 0.300 M aqueous solution of KCN to answer the following question(s).
-Refer to Exhibit 15-5. What is the pH of this 0.300 M KCN aqueous solution?

Accepted Answer

A)  pH = 0.523 
B)  pH = 2.66 
C)  pH = 10.64 
D)  pH = 11.34 
E)  pH = 11.85 
A)  pH = 0.523 
B)  pH = 2.66 
C)  pH = 10.64 
D)  pH = 11.34 
E)  pH = 11.85

Question 20

Milk of magnesia is essentially a saturated solution of Mg(OH)2 ( K sp = 8.9×10 - 12). What is the pH of a saturated Mg(OH)2 solution?

Accepted Answer

A)  10.32 
B)  5.52 
C)  10.12 
D)  10.42 
E)  >12.0 
A)  10.32 
B)  5.52 
C)  10.12 
D)  10.42 
E)  >12.0

Exam 15: Solutions of Acids and Bases

Measurements show that the [OH - ] of a solution is 6.02×10 - 6 M. The pH of this solution is:

Consider the following unfinished table of weak acids with their corresponding p K a values and K a values. Weak Acid p K a K a Benzoic acid 4.20 -- Lactic acid -- 1.4×10 - 4 Chlorous acid 1.96 -- Arrange these three acids in order of increasing acid strength .

Exhibit 15-5 Consider solving for the pH of a 0.300 M aqueous solution of KCN to answer the following question(s). -Refer to Exhibit 15-5. What is the [OH - ] ion concentration in this 0.300 M KCN aqueous solution?

What species are formed in the hydrolysis reaction of KCN with water? KCN + H₂ O ??

Identify the Lewis acid in the following reaction. CO2 + H2O→H2CO3

What is the conjugate acid of the species H2BO31 - ?

The pH of a solution is 5. The [H3O+] and [OH - ] are:

Consider the changes in acid strengths in the series HClO, HClO2, HClO3, and HClO4.

What is the pH of 2.0 liters of aqueous solution that contains 9.0 grams of HCl?

Exhibit 15-2 The pH of a solution of a certain brand of Cola is 2.27. Use this information to solve the following problem(s). Refer to Exhibit 15-2. What is the hydroxide ion concentration, [OH - ], of this solution?

A water soluble salt composed of the anion of a weak acid and the cation of a strong base is dissolved in pure water. The resulting solution:

Which of the following substances would be the strongest acid?

Benzoic acid is weak with K a = 6.3×10 - 5. What fraction ionizes in a 0.050 M solution?

Which of the following solutions will not be basic?

What is the conjugate acid of the species, HAsO42 - ?

Which species listed below is the conjugate base of NH3?

Exhibit 15-1 The pH of a certain brand of milk is 6.60. Use this information to answer the following question(s). -Refer to Exhibit 15-1. What is the molar concentration of hydroxide ion , [OH - ], in this milk?

Exhibit 15-1 The pH of a certain brand of milk is 6.60. Use this information to answer the following question(s). -Refer to Exhibit 15-1. What is the molar concentration of the hydronium ion , [H3O+], in this milk?

Exhibit 15-5 Consider solving for the pH of a 0.300 M aqueous solution of KCN to answer the following question(s). -Refer to Exhibit 15-5. What is the pH of this 0.300 M KCN aqueous solution?

Milk of magnesia is essentially a saturated solution of Mg(OH)2 ( K sp = 8.9×10 - 12). What is the pH of a saturated Mg(OH)2 solution?

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Measurements show that the [OH^-] of a solution is 6.02×10^{- 6} M. The pH of this solution is:

Consider the following unfinished table of weak acids with their corresponding p K _a values and K _a values. Weak Acid p K _a K _a Benzoic acid 4.20 -- Lactic acid -- 1.4×10^{- 4} Chlorous acid 1.96 -- Arrange these three acids in order of increasing acid strength .

Exhibit 15-5 Consider solving for the pH of a 0.300 M aqueous solution of KCN to answer the following question(s). -Refer to Exhibit 15-5. What is the [OH^-] ion concentration in this 0.300 M KCN aqueous solution?

Identify the Lewis acid in the following reaction. CO₂ + H₂O→H₂CO₃

What is the conjugate acid of the species H₂BO₃^{1 -}?

The pH of a solution is 5. The [H₃O⁺] and [OH^-] are:

Consider the changes in acid strengths in the series HClO, HClO₂, HClO₃, and HClO₄.

Exhibit 15-2 The pH of a solution of a certain brand of Cola is 2.27. Use this information to solve the following problem(s). Refer to Exhibit 15-2. What is the hydroxide ion concentration, [OH^-], of this solution?

Benzoic acid is weak with K _a = 6.3×10^{- 5}. What fraction ionizes in a 0.050 M solution?

What is the conjugate acid of the species, HAsO₄^{2 -}?

Which species listed below is the conjugate base of NH₃?

Exhibit 15-1 The pH of a certain brand of milk is 6.60. Use this information to answer the following question(s). -Refer to Exhibit 15-1. What is the molar concentration of hydroxide ion , [OH^-], in this milk?

Exhibit 15-1 The pH of a certain brand of milk is 6.60. Use this information to answer the following question(s). -Refer to Exhibit 15-1. What is the molar concentration of the hydronium ion , [H₃O⁺], in this milk?

Milk of magnesia is essentially a saturated solution of Mg(OH)₂ ( K _sp = 8.9×10^{- 12}). What is the pH of a saturated Mg(OH)₂ solution?