Question 1

What is the acid ionization constant , K a, for Hypobromous acid, if a 0.20 M aqueous solution of Hypobromous acid has a pH equal tO4.67?

Accepted Answer

A)  K a = 1.1×10 - 18 
B)  K a = 4.7×10 - 10 
C)  K a = 2.3×10 - 9 
D)  K a = 2.1×10 - 5 
E)  K a = 1.1×10 - 4 
A)  K a = 1.1×10 - 18 
B)  K a = 4.7×10 - 10 
C)  K a = 2.3×10 - 9 
D)  K a = 2.1×10 - 5 
E)  K a = 1.1×10 - 4

Question 2

Exhibit 15-6 Consider an aqueous 0.25 M solution of NaCN to answer the following question(s).
-Refer to Exhibit 15-6. What is the equilibrium molar concentration of hydroxide, [OH]eq, in this 0.25 M solution of NaCN?

Accepted Answer

A)  1.2×10 - 10 M 
B)  5.1×10 - 6 M 
C)  1.1×10 - 5 M 
D)  2.3×10 - 3 M 
E)  2.5×10 - 1 M 
A)  1.2×10 - 10 M 
B)  5.1×10 - 6 M 
C)  1.1×10 - 5 M 
D)  2.3×10 - 3 M 
E)  2.5×10 - 1 M

Question 3

K a for HF is 3.5×10 - 4. Calculate K b for the fluoride ion.

Accepted Answer

A)  2.8×103 
B)  3.5×10 - 4 
C)  1.0×10 - 7 
D)  3.5×10 - 10 
E)  2.8×10 - 11 
A)  2.8×103 
B)  3.5×10 - 4 
C)  1.0×10 - 7 
D)  3.5×10 - 10 
E)  2.8×10 - 11

Question 4

Which statement below is true regarding the salt, sodium benzoate NaC7H5O2, a food preservative?

Accepted Answer

A)  Sodium benzoate is a neutral salt derived from the parent strong acid HC7H5O2 and strong base NaOH. 
B)  Sodium benzoate is an acidic salt derived from the parent strong acid HC7H5O2 and weak base NaOH. 
C)  Sodium benzoate is an acidic salt derived from the parent weak acid HC7H5O2 and strong base NaOH. 
D)  Sodium benzoate is a basic salt derived from the parent weak acid HC7H5O2 and strong base NaOH. 
E)  Sodium benzoate is a basic salt derived from the parent strong acid HC7H5O2 and weak base NaOH. 
A)  Sodium benzoate is a neutral salt derived from the parent strong acid HC7H5O2 and strong base NaOH. 
B)  Sodium benzoate is an acidic salt derived from the parent strong acid HC7H5O2 and weak base NaOH. 
C)  Sodium benzoate is an acidic salt derived from the parent weak acid HC7H5O2 and strong base NaOH. 
D)  Sodium benzoate is a basic salt derived from the parent weak acid HC7H5O2 and strong base NaOH. 
E)  Sodium benzoate is a basic salt derived from the parent strong acid HC7H5O2 and weak base NaOH.

Question 5

Which compound is a strong base in water?

Accepted Answer

A)  H2SO4 
B)  NH3 
C)  HF 
D)  NaOH 
E)  none of these 
A)  H2SO4 
B)  NH3 
C)  HF 
D)  NaOH 
E)  none of these

Question 6

What is the base ionization constant , K b, for ClO21 -  if the acid ionization constant, K a, of HClO2 equals 1.1×10 - 2?

Accepted Answer

A)  K b = 1.1×10 - 16 
B)  K b = 9.1×10 - 13 
C)  K b = 1.1×10 - 2 
D)  K b = 9.1×101 
E)  K b = 1.1×1012 
A)  K b = 1.1×10 - 16 
B)  K b = 9.1×10 - 13 
C)  K b = 1.1×10 - 2 
D)  K b = 9.1×101 
E)  K b = 1.1×1012

Question 7

What is the pH of a 1.6 M aqueous solution of Sr(OH)2?

Accepted Answer

A)  pH = - 0.49 
B)  pH = 12.87 
C)  pH = 13.81 
D)  pH = 14.19 
E)  pH = 14.50 
A)  pH = - 0.49 
B)  pH = 12.87 
C)  pH = 13.81 
D)  pH = 14.19 
E)  pH = 14.50

Question 8

What is the pH of a 0.20 M KCN aqueous solution?
K a(HCN) = 6.2×10 - 10

Accepted Answer

A)  pH = 2.74 
B)  pH = 8.51 
C)  pH = 9.05 
D)  pH = 10.98 
E)  pH = 11.26 
A)  pH = 2.74 
B)  pH = 8.51 
C)  pH = 9.05 
D)  pH = 10.98 
E)  pH = 11.26

Question 9

Employing a neutralization reaction , which reactants are required to prepare the salt Barium acetate, Ba(CH3COO)2 reactants?
→Ba(CH3COO)2

Accepted Answer

A)  BaCl2 and CH3COOH 
B)  Ba(NO3)2 and CH3COOH 
C)  Ba(OH)2 and CH3COONa 
D)  Ba(OH)2 and CH3COOH 
E)  Ba(OH)2 and HCl 
A)  BaCl2 and CH3COOH 
B)  Ba(NO3)2 and CH3COOH 
C)  Ba(OH)2 and CH3COONa 
D)  Ba(OH)2 and CH3COOH 
E)  Ba(OH)2 and HCl

Question 10

Which gives an acidic solution when dissolved in water?

Accepted Answer

A)  Na2O 
B)  NH3 
C)  NH4Br 
D)  NaCN 
E)  none of these 
A)  Na2O 
B)  NH3 
C)  NH4Br 
D)  NaCN 
E)  none of these

Question 11

Calculate the pOH of a solution made by dissolving 2.0 grams of NaOH (molar mass = 40.0 g/mol) in water and diluting tO5 00 mL.

Accepted Answer

A)  1.00 
B)  13.00 
C)  1.12 
D)  1.30 
E)  12.70 
A)  1.00 
B)  13.00 
C)  1.12 
D)  1.30 
E)  12.70

Question 12

What is the conjugate acid of HBO32 - ?

Accepted Answer

A)  H3BO3 
B)  H2BO31 -  
C)  H2BO33 -  
D)  BO33 -  
E)  BO31 -  
A)  H3BO3 
B)  H2BO31 -  
C)  H2BO33 -  
D)  BO33 -  
E)  BO31 -

Question 13

The pH of a certain specimen of urine is 4.8. What is the hydroxide ion concentration, [OH - ], of this solution?

Accepted Answer

A)  [OH - ] = 1.6×10 - 19 M 
B)  [OH - ] = 6.3×10 - 10 M 
C)  [OH - ] = 1.6×10 - 5 M 
D)  [OH - ] = 6.3×104 M 
E)  [OH - ] = 1.6×109 M 
A)  [OH - ] = 1.6×10 - 19 M 
B)  [OH - ] = 6.3×10 - 10 M 
C)  [OH - ] = 1.6×10 - 5 M 
D)  [OH - ] = 6.3×104 M 
E)  [OH - ] = 1.6×109 M

Question 14

K a for HF is 3.5×10 - 4. A 0.10 M solution of sodium fluoride is:

Accepted Answer

A)  strongly acidic. 
B)  weakly acidic. 
C)  neutral. 
D)  weakly basic. 
E)  strongly basic. 
A)  strongly acidic. 
B)  weakly acidic. 
C)  neutral. 
D)  weakly basic. 
E)  strongly basic.

Question 15

Which of the following is a property of an acid?
I. Slippery to touch.
II. Tastes sour.
III. Reacts with active metals to form H2 gas.

Accepted Answer

A)  I only 
B)  II only 
C)  I and II 
D)  II and III 
E)  All of these 
A)  I only 
B)  II only 
C)  I and II 
D)  II and III 
E)  All of these

Question 16

To calculate the pH of a system that has 0.010 M HCl, 0.10 M HF, and 0.10 M HCOOH:

Accepted Answer

A)  Consider only the HCl. 
B)  Look up the K a values for HF and HCOOH and use the stronger to calculate the pH. 
C)  Add up the concentrations of HF and HCOOH and use the average value of K a. 
D)  Titrate with NaOH in the lab. 
E)  Calculate K b for all the species and rank them on a number line. 
A)  Consider only the HCl. 
B)  Look up the K a values for HF and HCOOH and use the stronger to calculate the pH. 
C)  Add up the concentrations of HF and HCOOH and use the average value of K a. 
D)  Titrate with NaOH in the lab. 
E)  Calculate K b for all the species and rank them on a number line.

Question 17

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 pOH of this solution?

Accepted Answer

A)  0.99 
B)  6.17 
C)  11.73 
D)  16.27 
E)  27.01 
A)  0.99 
B)  6.17 
C)  11.73 
D)  16.27 
E)  27.01

Question 18

Given the following Bronsted-Lowery acid-base reaction and its corresponding equilibrium constant, which substance is the strongest acid ?
CH ₃CH ₂ NH₃+ + ClO21 -   CH ₃CH ₂ NH₂ + HClO ₂ K = 2.1 10 - 9

Accepted Answer

A)  CH3CH2NH3+ 
B)  ClO21 -  
C)  CH3CH2NH2 
D)  HClO2 
A)  CH3CH2NH3+ 
B)  ClO21 -  
C)  CH3CH2NH2 
D)  HClO2

Question 19

What is the hydroxide ion concentration in a solution of 0.40 M hypochlorous acid (HOCl)?
K a = 3.0×10 - 8

Accepted Answer

A)  1.3×10 - 8 
B)  1.1×10 - 4 
C)  9.1×10 - 11 
D)  2.5×10 - 14 
E)  none of these 
A)  1.3×10 - 8 
B)  1.1×10 - 4 
C)  9.1×10 - 11 
D)  2.5×10 - 14 
E)  none of these

Question 20

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 base ionization constant, K b, of CN -  if the acid ionization constant, K a, of HCN is 6.2×10 - 10?

Accepted Answer

A)  K b = 6.2×10 - 24 
B)  K b = 1.9×10 - 10 
C)  K b = 1.6×10 - 5 
D)  K b = 9.21 
E)  K b = 6.2×104 
A)  K b = 6.2×10 - 24 
B)  K b = 1.9×10 - 10 
C)  K b = 1.6×10 - 5 
D)  K b = 9.21 
E)  K b = 6.2×104

Exam 15: Solutions of Acids and Bases

What is the acid ionization constant , K a, for Hypobromous acid, if a 0.20 M aqueous solution of Hypobromous acid has a pH equal tO4.67?

Exhibit 15-6 Consider an aqueous 0.25 M solution of NaCN to answer the following question(s). -Refer to Exhibit 15-6. What is the equilibrium molar concentration of hydroxide, [OH]eq, in this 0.25 M solution of NaCN?

K a for HF is 3.5×10 - 4. Calculate K b for the fluoride ion.

Which statement below is true regarding the salt, sodium benzoate NaC7H5O2, a food preservative?

Which compound is a strong base in water?

What is the base ionization constant , K b, for ClO21 - if the acid ionization constant, K a, of HClO2 equals 1.1×10 - 2?

What is the pH of a 1.6 M aqueous solution of Sr(OH)2?

What is the pH of a 0.20 M KCN aqueous solution? K a(HCN) = 6.2×10 - 10

Employing a neutralization reaction , which reactants are required to prepare the salt Barium acetate, Ba(CH3COO)2 reactants? →Ba(CH3COO)2

Which gives an acidic solution when dissolved in water?

Calculate the pOH of a solution made by dissolving 2.0 grams of NaOH (molar mass = 40.0 g/mol) in water and diluting tO5 00 mL.

What is the conjugate acid of HBO32 - ?

The pH of a certain specimen of urine is 4.8. What is the hydroxide ion concentration, [OH - ], of this solution?

K a for HF is 3.5×10 - 4. A 0.10 M solution of sodium fluoride is:

Which of the following is a property of an acid? I. Slippery to touch. II. Tastes sour. III. Reacts with active metals to form H2 gas.

To calculate the pH of a system that has 0.010 M HCl, 0.10 M HF, and 0.10 M HCOOH:

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 pOH of this solution?

Given the following Bronsted-Lowery acid-base reaction and its corresponding equilibrium constant, which substance is the strongest acid ? CH ₃CH ₂ NH₃+ + ClO21 - CH ₃CH ₂ NH₂ + HClO ₂ K = 2.1 10 - 9

What is the hydroxide ion concentration in a solution of 0.40 M hypochlorous acid (HOCl)? K a = 3.0×10 - 8

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 base ionization constant, K b, of CN - if the acid ionization constant, K a, of HCN is 6.2×10 - 10?

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Filters

What is the acid ionization constant , K _a, for Hypobromous acid, if a 0.20 M aqueous solution of Hypobromous acid has a pH equal tO₄.67?

Exhibit 15-6 Consider an aqueous 0.25 M solution of NaCN to answer the following question(s). -Refer to Exhibit 15-6. What is the equilibrium molar concentration of hydroxide, [OH]_eq, in this 0.25 M solution of NaCN?

K _a for HF is 3.5×10^{- 4}. Calculate K _b for the fluoride ion.

Which statement below is true regarding the salt, sodium benzoate NaC₇H₅O₂, a food preservative?

What is the base ionization constant , K _b, for ClO₂^{1 -} if the acid ionization constant, K _a, of HClO₂ equals 1.1×10^{- 2}?

What is the pH of a 1.6 M aqueous solution of Sr(OH)₂?

What is the pH of a 0.20 M KCN aqueous solution? K _a(HCN) = 6.2×10^{- 10}

Employing a neutralization reaction , which reactants are required to prepare the salt Barium acetate, Ba(CH₃COO)₂ reactants? →Ba(CH₃COO)₂

Calculate the pOH of a solution made by dissolving 2.0 grams of NaOH (molar mass = 40.0 g/mol) in water and diluting tO₅ 00 mL.

What is the conjugate acid of HBO₃^{2 -}?

The pH of a certain specimen of urine is 4.8. What is the hydroxide ion concentration, [OH^-], of this solution?

K _a for HF is 3.5×10^{- 4}. A 0.10 M solution of sodium fluoride is:

Which of the following is a property of an acid? I. Slippery to touch. II. Tastes sour. III. Reacts with active metals to form H₂ gas.

Given the following Bronsted-Lowery acid-base reaction and its corresponding equilibrium constant, which substance is the strongest acid ? CH ₃CH ₂ NH₃+ + ClO₂₁ - CH ₃CH ₂ NH₂ + HClO ₂ K = 2.1 10 - 9

What is the hydroxide ion concentration in a solution of 0.40 M hypochlorous acid (HOCl)? K _a = 3.0×10^{- 8}

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 base ionization constant, K _b, of CN^- if the acid ionization constant, K _a, of HCN is 6.2×10^{- 10}?