Question 1

The conjugate base of H2PO4- is ________.

Accepted Answer

A)  H3PO4
B)  HPO42-
C)  PO43-
D)  H3O+
E)  OH-

Question 2

The hydride ion, H-, is a stronger base than the hydroxide ion, OH-. The product(s) of the reaction of hydride ion with water is/are ________.

Accepted Answer

A)  H3O+ (aq) 
B)  OH- (aq)  + H2 (g) 
C)  OH- (aq)  + 2H+ (aq) 
D)  no reaction occurs
E)  H2O2 (aq)

Question 3

A substance that is capable of acting as both an acid and as a base is ________.

Accepted Answer

A)  autosomal
B)  conjugated
C)  ambiprotic
D)  saturated
E)  miscible

Question 4

Kb for NH3 is 1.8 × 10-5. What is the pH of a 0.40 M aqueous solution of NH4Cl at 25.0 °C?

Accepted Answer

A)  2.57
B)  11.43
C)  9.18
D)  4.82
E)  11.23

Question 5

What is the conjugate acid of CO32- ?

Accepted Answer

A)  CO22-
B)  HCO22-
C)  H2CO3
D)  HCO3-
E)  none of the above

Question 6

HA is a weak acid. Which equilibrium corresponds to the equilibrium constant Kb for A-?

Accepted Answer

A)  HA (aq)  + H2O (l)  b for A-? 
A)  HA (aq)  + H2O (l)    H2A+ (aq)  + OH-(aq)  
B)  A- (aq)  + H3O+ (aq)    HA (aq)  + H2O (l)  
C)  HA (aq)  + OH- (aq)    H2O (l)  + H+ (aq)  
D)  A- (aq)  + H2O (l)    HA (aq)  + OH- (aq)  
E)  A- (aq)  + OH- (aq)    HOA2- (aq) " class="answers-bank-image d-inline" rel="preload" > H2A+ (aq)  + OH-(aq) 
B)  A- (aq)  + H3O+ (aq)  b for A-? 
A)  HA (aq)  + H2O (l)    H2A+ (aq)  + OH-(aq)  
B)  A- (aq)  + H3O+ (aq)    HA (aq)  + H2O (l)  
C)  HA (aq)  + OH- (aq)    H2O (l)  + H+ (aq)  
D)  A- (aq)  + H2O (l)    HA (aq)  + OH- (aq)  
E)  A- (aq)  + OH- (aq)    HOA2- (aq) " class="answers-bank-image d-inline" rel="preload" > HA (aq)  + H2O (l) 
C)  HA (aq)  + OH- (aq)  b for A-? 
A)  HA (aq)  + H2O (l)    H2A+ (aq)  + OH-(aq)  
B)  A- (aq)  + H3O+ (aq)    HA (aq)  + H2O (l)  
C)  HA (aq)  + OH- (aq)    H2O (l)  + H+ (aq)  
D)  A- (aq)  + H2O (l)    HA (aq)  + OH- (aq)  
E)  A- (aq)  + OH- (aq)    HOA2- (aq) " class="answers-bank-image d-inline" rel="preload" > H2O (l)  + H+ (aq) 
D)  A- (aq)  + H2O (l)  b for A-? 
A)  HA (aq)  + H2O (l)    H2A+ (aq)  + OH-(aq)  
B)  A- (aq)  + H3O+ (aq)    HA (aq)  + H2O (l)  
C)  HA (aq)  + OH- (aq)    H2O (l)  + H+ (aq)  
D)  A- (aq)  + H2O (l)    HA (aq)  + OH- (aq)  
E)  A- (aq)  + OH- (aq)    HOA2- (aq) " class="answers-bank-image d-inline" rel="preload" > HA (aq)  + OH- (aq) 
E)  A- (aq)  + OH- (aq)  b for A-? 
A)  HA (aq)  + H2O (l)    H2A+ (aq)  + OH-(aq)  
B)  A- (aq)  + H3O+ (aq)    HA (aq)  + H2O (l)  
C)  HA (aq)  + OH- (aq)    H2O (l)  + H+ (aq)  
D)  A- (aq)  + H2O (l)    HA (aq)  + OH- (aq)  
E)  A- (aq)  + OH- (aq)    HOA2- (aq) " class="answers-bank-image d-inline" rel="preload" > HOA2- (aq)

Question 7

A 0.1 M aqueous solution of ________ will have a pH of 7.0 at 25.0 °C. LiF RbBr NaClO4 NH4Cl

Accepted Answer

A)  RbBr and NaClO4
B)  LiF and RbBr
C)  NaClO4 only
D)  LiF only
E)  NH4Cl only

Question 8

The base-dissociation constant of ethylamine (C2H5NH2) is 6.4 × 10-4 at 25.0 °C. The [H+] in a 1.4 × 10-2 M solution of ethylamine is ________ M.

Accepted Answer

A)  3.7 × 4.9 × 10-12
B)  2.7 × 10-3
C)  3.3 × 10-12
D)  3.0 × 10-3
E)  11.43

Question 9

The Ka of hypochlorous acid (HClO) is 3.0 × 10-8 at 25.0 °C. Calculate the pH of a 0.0385 M hypochlorous acid solution.

Accepted Answer

A)  3.05
B)  9.53
C)  4.47
D)  6.52
E)  -3.05

Question 10

Classify the following compounds as weak acids (W) or strong acids (S) : hypochlorous acid perchloric acid chloric acid

Accepted Answer

A)  W S S
B)  S S S
C)  S W W
D)  W W W
E)  W S W

Question 11

In the reaction
BF3 + F- → BF4-
BF3 acts as a Br∅nsted-Lowry acid.

Accepted Answer

A) True 
 B)False

Question 12

What is the pOH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydronium ion?

Accepted Answer

A)  8.400
B)  5.600
C)  9.000
D)  3.980
E)  7.000

Question 13

A Br∅nsted-Lowry base is defined as a substance that ________.

Accepted Answer

A)  increases [H+] when placed in H2O
B)  decreases [H+] when placed in H2O
C)  increases [OH-] when placed in H2O
D)  acts as a proton acceptor
E)  acts as a proton donor

Question 14

Of the following acids, ________ is a strong acid.

Accepted Answer

A)  HNO2
B)  H2CO3
C)  HNO3
D)  HClO
E)  HF

Question 15

Using the data in the table, which of the conjugate acids below is the strongest acid? 3- C) H2S D) NH3CH3+ E) H2S and HClO" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  HClO
B)  HCO3-
C)  H2S
D)  NH3CH3+
E)  H2S and HClO

Question 16

Using the data in the table, which of the conjugate bases below is the weakest base? - B) C7H5O2- C) NO2- D) F- E) OAc- and C7H5O2-" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  OAc-
B)  C7H5O2-
C)  NO2-
D)  F-
E)  OAc- and C7H5O2-

Question 17

Determine the pH of a 0.15 M aqueous solution of KF. For hydrofluoric acid, Ka = 7.0 × 10-4.

Accepted Answer

A)  0.82
B)  5.83
C)  8.17
D)  5.01
E)  1.17

Question 18

Classify the following compounds as weak bases (W) or strong bases (S) : ammonia fluoride ion sodium hydroxide

Accepted Answer

A)  W W S
B)  S S S
C)  S W W
D)  W S S
E)  W S W

Question 19

What is the pH of a 0.020 M aqueous solution of barium hydroxide?

Accepted Answer

A)  12.60
B)  12.30
C)  1.70
D)  10.41
E)  1.40

Question 20

Calculate the pOH of a 0.0727 M aqueous sodium cyanide solution at 25.0 °C. Kb for CN- is 4.9 × 10-10.

Accepted Answer

A)  9.33
B)  10.00
C)  5.22
D)  1.14
E)  8.78

Exam 16: Acid-Base Equilibria

Of the following acids, ________ is a strong acid.

Correct AnswerverifiedShow Answer

HA is a weak acid. Which equilibrium corresponds to the equilibrium constant Kb for A-?

Correct AnswerverifiedShow Answer

The Ka of hypochlorous acid (HClO) is 3.0 × 10-8 at 25.0 °C. Calculate the pH of a 0.0385 M hypochlorous acid solution.

Correct AnswerverifiedShow Answer

In the reaction BF3 + F- → BF4- BF3 acts as a Br∅nsted-Lowry acid.

Correct AnswerverifiedShow Answer

The conjugate base of H2PO4- is ________.

Correct AnswerverifiedShow Answer

Classify the following compounds as weak acids (W) or strong acids (S) : hypochlorous acid perchloric acid chloric acid

Correct AnswerverifiedShow Answer

Determine the pH of a 0.15 M aqueous solution of KF. For hydrofluoric acid, Ka = 7.0 × 10-4.

Correct AnswerverifiedShow Answer

Kb for NH3 is 1.8 × 10-5. What is the pH of a 0.40 M aqueous solution of NH4Cl at 25.0 °C?

Correct AnswerverifiedShow Answer

A Br∅nsted-Lowry base is defined as a substance that ________.

Correct AnswerverifiedShow Answer

The hydride ion, H-, is a stronger base than the hydroxide ion, OH-. The product(s) of the reaction of hydride ion with water is/are ________.

Correct AnswerverifiedShow Answer

Using the data in the table, which of the conjugate acids below is the strongest acid?

Correct AnswerverifiedShow Answer

Classify the following compounds as weak bases (W) or strong bases (S) : ammonia fluoride ion sodium hydroxide

Correct AnswerverifiedShow Answer

A 0.1 M aqueous solution of ________ will have a pH of 7.0 at 25.0 °C. LiF RbBr NaClO4 NH4Cl

Correct AnswerverifiedShow Answer

The base-dissociation constant of ethylamine (C2H5NH2) is 6.4 × 10-4 at 25.0 °C. The [H+] in a 1.4 × 10-2 M solution of ethylamine is ________ M.

Correct AnswerverifiedShow Answer

Calculate the pOH of a 0.0727 M aqueous sodium cyanide solution at 25.0 °C. Kb for CN- is 4.9 × 10-10.

Correct AnswerverifiedShow Answer

Using the data in the table, which of the conjugate bases below is the weakest base?

Correct AnswerverifiedShow Answer

What is the conjugate acid of CO32- ?

Correct AnswerverifiedShow Answer

What is the pOH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydronium ion?

Correct AnswerverifiedShow Answer

What is the pH of a 0.020 M aqueous solution of barium hydroxide?

Correct AnswerverifiedShow Answer

A substance that is capable of acting as both an acid and as a base is ________.

Correct AnswerverifiedShow Answer

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HA is a weak acid. Which equilibrium corresponds to the equilibrium constant K_b for A^-?

Correct Answer
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The K_a of hypochlorous acid (HClO) is 3.0 × 10^-⁸ at 25.0 °C. Calculate the pH of a 0.0385 M hypochlorous acid solution.

Correct Answer
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In the reaction BF₃ + F^- → BF₄^- BF₃ acts as a Br∅nsted-Lowry acid.

Correct Answer
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The conjugate base of H₂PO₄^- is ________.

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Determine the pH of a 0.15 M aqueous solution of KF. For hydrofluoric acid, K_a = 7.0 × 10^-4.

Correct Answer
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K_b for NH₃ is 1.8 × 10^-⁵. What is the pH of a 0.40 M aqueous solution of NH₄Cl at 25.0 °C?

Correct Answer
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The hydride ion, H^-, is a stronger base than the hydroxide ion, OH^-. The product(s) of the reaction of hydride ion with water is/are ________.

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A 0.1 M aqueous solution of ________ will have a pH of 7.0 at 25.0 °C. LiF RbBr NaClO₄ NH₄Cl

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The base-dissociation constant of ethylamine (C₂H₅NH₂) is 6.4 × 10^-⁴ at 25.0 °C. The [H⁺] in a 1.4 × 10^-² M solution of ethylamine is ________ M.

Correct Answer
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Calculate the pOH of a 0.0727 M aqueous sodium cyanide solution at 25.0 °C. K_b for CN^- is 4.9 × 10^-¹⁰.

Correct Answer
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What is the conjugate acid of CO₃²^-?

Correct Answer
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What is the pOH of an aqueous solution at 25.0 °C that contains 3.98 × 10^-9 M hydronium ion?

Correct Answer
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