Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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 8

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 9

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 10

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 11

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 12

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 13

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 14

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 15

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

Accepted Answer

A) True 
 B)False

Question 16

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 17

What is the conjugate acid of CO32- ?

Accepted Answer

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

Question 18

The conjugate base of H2PO4- is ________.

Accepted Answer

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

Question 19

Of the following acids, ________ is a strong acid.

Accepted Answer

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

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

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

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The conjugate base of H2PO4- is ________.

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

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

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

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 pH of a 0.020 M aqueous solution of barium hydroxide?

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

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

Correct AnswerverifiedShow Answer

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

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

What is the conjugate acid of CO32- ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

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The conjugate base of H₂PO₄^- is ________.

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 ________.

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

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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?

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

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

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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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