Question 1

Regarding acid strength, which of the following is not correctly assigned?

Accepted Answer

A)  (stronger acid) H2CO3 > HCO31 -  (weaker acid) 
B)  (stronger acid) H2Se > H2Te (weaker acid) 
C)  (stronger acid) H2O > NH3 (weaker acid) 
D)  (stronger acid) H2SO4 > H3PO4 (weaker acid) 
E)  (stronger acid) HClO2 > HClO (weaker acid)

Question 2

The hydroxide ion concentration in a solution with pH = 3.50 is:

Accepted Answer

A)  3.2×10 - 2 M 
B)  3.2×10 - 4 M 
C)  3.2×10 - 11 M 
D)  3.2×10 - 10 M 
E)  none of these

Question 3

What is the pH of a 2.6 M aqueous solution of Ba(OH)2?

Accepted Answer

A)  7.94×10 - 6 
B)  0.71 
C)  13.29 
D)  14.41 
E)  14.72

Question 4

The following equilibrium is established in water solution:
HCOOH + H2O→HCOO -  + H3O+ K  a = 1.8×10 - 4 Which of the following is false?

Accepted Answer

A)  HCOO -  is the conjugate acid of HCOOH. 
B)  H2O is the conjugate base of H3O+. 
C)  HCOOH is a weak acid. 
D)  H2O is a weak base. 
E)  Hydroxide concentration is negligible with respect to hydrogen ion concentration.

Question 5

What is the acid ionization constant , K a, for lactic acid, CH3CH(OH)COOH, if the base ionization constant, K b, of CH3CH(OH)COO -  equals 7.1×10 - 11?

Accepted Answer

A)  K a = 7.1×10 - 25 
B)  K a = 7.1×10 - 11 
C)  K a = 1.4×10 - 4 
D)  K a = 7.1×103 
E)  K a = 1.4×1024

Question 6

Pyridine (p K b = 8.74) reacts with formic acid (p K a = 3.74) to form the pyridinium ion and the formate ion:
C6H5N + HCOOH→C5H5NH+ + HCOO -  Which of the following is true?

Accepted Answer

A)  Pyridinium ion is a stronger acid than formic acid. 
B)  Formate ion is a stronger base than pyridine. 
C)  A solution which is 0.1 M pyridine and 0.1 M pyridinium chloride is basic. 
D)  A solution which is 0.1 M formic acid and 0.1 M sodium formate is basic. 
E)  A solution of 0.1 M pyridine and 0.1 M sodium formate is basic.

Question 7

Exhibit 15-3 Ephedrine (CS1U1B110S1U1B0HS1U1B115S1U1B0ON), a central nervous system stimulant, is used in nasal sprays as a decongestant. This compound is a weak organic base :
CS1U1B110S1U1B0HS1U1B115S1U1B0ON (aq) + H₂ O  HCS1U1B110S1U1B0HS1U1B115S1U1B0ON + (aq) + OH - (aq) Consider a 0.035 M
Solution of ephedrine that has a pH of 11.33 to answer the following problem(s).
-Refer to Exhibit 15-3. What is the base ionization constant , K b , for the dissolution of ephedrine in water?

Accepted Answer

A)  6.3×10 - 22 
B)  7.5×10 - 11 
C)  1.3×10 - 4 
D)  2.1×10 - 3 
E)  6.4×10 - 2

Question 8

Employing a neutralization reaction , which reactants are used to prepare the salt Potassium Sulfate, K2SO4 reactants?
→K2SO4

Accepted Answer

A)  KCl and H2SO4 
B)  KNO3 and H2SO4 
C)  KOH and H2SO4 
D)  KOH and Na2SO4 
E)  KCl and Na2SO4

Question 9

A weak acid

Accepted Answer

A)  does not react with base 
B)  does not react with glass 
C)  does not burn skin 
D)  does not dissociate fully 
E)  does not pose a disposal problem

Question 10

Which of the following aqueous solutions is(are) considered acidic ?
I. pOH = 12.0
II. [H3O+] = 4.2×10 - 9
III. [OH - ] = 5.3×10 - 10

Accepted Answer

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

Question 11

From the information given below which one of the 5 solutions would be the most acidic?

Accepted Answer

A)  pH = 6 
B)  pOH = 9 
C)  [H3O+] = 10 - 3 M 
D)  [OH - ] = 10 - 10 
E)  pOH = 12

Question 12

The definition of a Lewis base is:

Accepted Answer

A)  an electron pair donor. 
B)  a proton donor. 
C)  boron trifluoride. 
D)  an electron pair acceptor. 
E)  an electrophile.

Question 13

The pH of a 0.0338 M solution of a weak acid is 2.85. What is K a of this acid?

Accepted Answer

A)  3.4×10 - 2 
B)  1.4×10 - 3 
C)  3.4×10 - 4 
D)  6.2×10 - 5 
E)  5.9×10 - 5

Question 14

Identify the Lewis acid in the following Lewis-Acid base reaction. Fe3+ + 6 H2O→[Fe(H2O)6]3+

Accepted Answer

A)  Fe3+ 
B)  H2O 
C)  [Fe(H2O)6]3+ 
D)  H3O+ 
E)  None of these

Question 15

Which of the following salts would be considered a basic salt when dissolved in water?

Accepted Answer

A)  KBr 
B)  NaCl 
C)  LiF 
D)  Na2SO4 
E)  CsI

Question 16

What is the pH of an aqueous 3.3 M Ba(OH)2 solution?

Accepted Answer

A)  pH = - 0.51 
B)  pH = - 0.81 
C)  pH = 13.19 
D)  pH = 13.49 
E)  pH = 14.82

Question 17

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 HNO2 3.35 -- HF -- 6.8×10 - 4 HCN 9.31 --
Arrange these three acids in order of increasing acid strength .

Accepted Answer

A)  (weakest) HNO2 2 2 (strongest) 
D)  (weakest) HCN 2 2 < HCN (strongest)

Question 18

Which of these aqueous solutions would have a pH greater than 7?

Accepted Answer

A)  a solution of HCl 
B)  a solution of a weak acid 
C)  a solution of a strong acid 
D)  a solution of sodium acetate 
E)  a solution of ammonium chloride

Question 19

Which salt(s) listed below form(s) an acidic aqueous solution when dissolved in water?
I. KNO2
II. NaF
III. NH4ClO4

Accepted Answer

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

Question 20

A 0.050 M solution of ammonium chloride is prepared. Find the H3O+ concentration:
( K b for ammonia = 1.8×10 - 5)

Accepted Answer

A)  5.3×10 - 6 M 
B)  5.3×10 - 4 M 
C)  2.0×10 - 13 M 
D)  9.5×10 - 4 M 
E)  none of these

Exam 15: Solutions of Acids and Bases

Regarding acid strength, which of the following is not correctly assigned?

The hydroxide ion concentration in a solution with pH = 3.50 is:

What is the pH of a 2.6 M aqueous solution of Ba(OH) ₂?

The following equilibrium is established in water solution: HCOOH + H₂O→HCOO^- + H₃O⁺ K _a = 1.8×10^{- 4} Which of the following is false?

What is the acid ionization constant , K _a, for lactic acid, CH₃CH(OH) COOH, if the base ionization constant, K _b, of CH₃CH(OH) COO^- equals 7.1×10^{- 11}?

Pyridine (p K _b = 8.74) reacts with formic acid (p K _a = 3.74) to form the pyridinium ion and the formate ion: C₆H₅N + HCOOH→C₅H₅NH⁺ + HCOO^- Which of the following is true?

Employing a neutralization reaction , which reactants are used to prepare the salt Potassium Sulfate, K₂SO₄ reactants? →K₂SO₄

A weak acid

Which of the following aqueous solutions is(are) considered acidic ? I. pOH = 12.0 II. [H₃O⁺] = 4.2×10^{- 9} III. [OH^-] = 5.3×10^{- 10}

From the information given below which one of the 5 solutions would be the most acidic?

The definition of a Lewis base is:

The pH of a 0.0338 M solution of a weak acid is 2.85. What is K _aof this acid?

Identify the Lewis acid in the following Lewis-Acid base reaction. Fe³⁺ + 6 H₂O→[Fe(H₂O) ₆]³⁺

Which of the following salts would be considered a basic salt when dissolved in water?

What is the pH of an aqueous 3.3 M Ba(OH) ₂ solution?

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 HNO₂ 3.35 -- HF -- 6.8×10^{- 4} HCN 9.31 -- Arrange these three acids in order of increasing acid strength .

Which of these aqueous solutions would have a pH greater than 7?

Which salt(s) listed below form(s) an acidic aqueous solution when dissolved in water? I. KNO₂ II. NaF III. NH₄ClO₄

A 0.050 M solution of ammonium chloride is prepared. Find the H₃O⁺ concentration: ( K _b for ammonia = 1.8×10^{- 5})

Exam 15: Solutions of Acids and Bases

Regarding acid strength, which of the following is not correctly assigned?

The hydroxide ion concentration in a solution with pH = 3.50 is:

What is the pH of a 2.6 M aqueous solution of Ba(OH) 2?

The following equilibrium is established in water solution: HCOOH + H2O→HCOO - + H3O+ K a = 1.8×10 - 4 Which of the following is false?

What is the acid ionization constant , K a, for lactic acid, CH3CH(OH) COOH, if the base ionization constant, K b, of CH3CH(OH) COO - equals 7.1×10 - 11?

Pyridine (p K b = 8.74) reacts with formic acid (p K a = 3.74) to form the pyridinium ion and the formate ion: C6H5N + HCOOH→C5H5NH+ + HCOO - Which of the following is true?

Employing a neutralization reaction , which reactants are used to prepare the salt Potassium Sulfate, K2SO4 reactants? →K2SO4

A weak acid

Which of the following aqueous solutions is(are) considered acidic ? I. pOH = 12.0 II. [H3O+] = 4.2×10 - 9 III. [OH - ] = 5.3×10 - 10

From the information given below which one of the 5 solutions would be the most acidic?

The definition of a Lewis base is:

The pH of a 0.0338 M solution of a weak acid is 2.85. What is K a of this acid?

Identify the Lewis acid in the following Lewis-Acid base reaction. Fe3+ + 6 H2O→[Fe(H2O) 6]3+

Which of the following salts would be considered a basic salt when dissolved in water?

What is the pH of an aqueous 3.3 M Ba(OH) 2 solution?

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 HNO2 3.35 -- HF -- 6.8×10 - 4 HCN 9.31 -- Arrange these three acids in order of increasing acid strength .

Which of these aqueous solutions would have a pH greater than 7?

Which salt(s) listed below form(s) an acidic aqueous solution when dissolved in water? I. KNO2 II. NaF III. NH4ClO4

A 0.050 M solution of ammonium chloride is prepared. Find the H3O+ concentration: ( K b for ammonia = 1.8×10 - 5)

What is the pH of a 2.6 M aqueous solution of Ba(OH) ₂?

The following equilibrium is established in water solution: HCOOH + H₂O→HCOO^- + H₃O⁺ K _a = 1.8×10^{- 4} Which of the following is false?

What is the acid ionization constant , K _a, for lactic acid, CH₃CH(OH) COOH, if the base ionization constant, K _b, of CH₃CH(OH) COO^- equals 7.1×10^{- 11}?

Pyridine (p K _b = 8.74) reacts with formic acid (p K _a = 3.74) to form the pyridinium ion and the formate ion: C₆H₅N + HCOOH→C₅H₅NH⁺ + HCOO^- Which of the following is true?

Employing a neutralization reaction , which reactants are used to prepare the salt Potassium Sulfate, K₂SO₄ reactants? →K₂SO₄

Which of the following aqueous solutions is(are) considered acidic ? I. pOH = 12.0 II. [H₃O⁺] = 4.2×10^{- 9} III. [OH^-] = 5.3×10^{- 10}

The pH of a 0.0338 M solution of a weak acid is 2.85. What is K _aof this acid?

Identify the Lewis acid in the following Lewis-Acid base reaction. Fe³⁺ + 6 H₂O→[Fe(H₂O) ₆]³⁺

What is the pH of an aqueous 3.3 M Ba(OH) ₂ solution?

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 HNO₂ 3.35 -- HF -- 6.8×10^{- 4} HCN 9.31 -- Arrange these three acids in order of increasing acid strength .

Which salt(s) listed below form(s) an acidic aqueous solution when dissolved in water? I. KNO₂ II. NaF III. NH₄ClO₄

A 0.050 M solution of ammonium chloride is prepared. Find the H₃O⁺ concentration: ( K _b for ammonia = 1.8×10^{- 5})