Question 1

Which of the following is an amphoteric substance?

Accepted Answer

A)  NaCl
B)  LiOH
C)  KBr
D)  NaHCO3 
E)  CH3OH

Question 2

Select the solution below that is the most acidic.

Accepted Answer

A)  [OH-] = 1.0 x 10-4 M
B)  [OH-] = 1.0 x 10-5 M
C)  [H3O+] = 1.0 x 10-6 M
D)  [H3O+] = 1.0 x 10-8 M
E)  [H3O+] = 1.0 x 10-10 M

Question 3

Which of the following ions is amphoteric?

Accepted Answer

A)  Br- 
B)  H- 
C)  OH+ 
D)  SO42- 
E)  HPO42-

Question 4

Match the molecular-level diagrams to each of the following compounds in aqueous solution: HCl, HF, NH3  3    A) I = HCl, II = HF, III = NH3  B) I = HF, II = HCl, III = NH3  C) I = HF, II = NH3, III = HCl D) I = NH3, II = HF, III = HCl E) I = NH3, II = HCl, III = HF" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I = HCl, II = HF, III = NH3 
B)  I = HF, II = HCl, III = NH3 
C)  I = HF, II = NH3, III = HCl
D)  I = NH3, II = HF, III = HCl
E)  I = NH3, II = HCl, III = HF

Question 5

In polyprotic acids, the first ionizable hydrogen always ionizes to a greater extent than the second or third ionizable hydrogen(s).

Accepted Answer

A) True 
 B)False

Question 6

Calculate the pH of a solution that has [H3O+] = 3.1 x 10-8 M.

Accepted Answer

A)  pH = 7.51
B)  pH = 8.00
C)  pH = 3.10
D)  pH = 3.18
E)  pH = 6.49

Question 7

Select the solution below that is the most acidic.

Accepted Answer

A)  [OH-] = 1.0 x 10-4 M
B)  [OH-] = 1.0 x 10-5 M
C)  [OH-] = 1.0 x 10-7 M
D)  [OH-] = 1.0 x 10-9 M
E)  [OH-] = 1.0 x 10-11 M

Question 8

List the acid, base, conjugate acid, and conjugate base, in that order, for the following reaction: HOCl(aq)  + H2O(l)  ⇌ OCl-(aq)  + H3O+(aq)

Accepted Answer

A)   2O(l)  ⇌ OCl-(aq)  + H3O+(aq)  
A)     
B)     
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D)     
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B)   2O(l)  ⇌ OCl-(aq)  + H3O+(aq)  
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B)     
C)     
D)     
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C)   2O(l)  ⇌ OCl-(aq)  + H3O+(aq)  
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B)     
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D)     
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D)   2O(l)  ⇌ OCl-(aq)  + H3O+(aq)  
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E)   2O(l)  ⇌ OCl-(aq)  + H3O+(aq)  
A)     
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Question 9

Select the pair that consists of an acid and its conjugate base in that order.

Accepted Answer

A)  NH3/NH4+ 
B)  SO42-/HSO3- 
C)  H2SO3/HSO3- 
D)  H2PO4-/H3PO4 
E)  CO32-/HCO32-

Question 10

Given 0.10 M solutions of the following acids, which contains the lowest concentration of H3O+?

Accepted Answer

A)  HF, Ka = 6.3 x 10-4 
B)  HCN, Ka = 6.2 x 10-10 
C)  HOCl, Ka = 4.0 x 10-8 
D)  CH3CO2H, Ka = 1.8 x 10-5 
E)  HCO2H, Ka = 1.8 x 10-4

Question 11

Select the strong acid from the following list.

Accepted Answer

A)  H2SO3(aq) 
B)  H2C2O4(aq) 
C)  H2S(aq) 
D)  HNO2(aq) 
E)  HI(aq)

Question 12

Calculate the pH of a solution that has [H3O+] = 5.9 x 10-5 M.

Accepted Answer

A)  pH = 5.90
B)  pH = 4.23
C)  pH = 5.00
D)  pH = 5.59
E)  pH = 9.77

Question 13

When the following reaction goes in the reverse direction (from products to reactants) , what is the acid? HCN(aq)  + H2O(l)  ⇌ CN-(aq)  + H3O+(aq)

Accepted Answer

A)  HCN
B)  H2O
C)  CN- 
D)  H3O+ 
E)  both CN- and H3O+

Question 14

When sodium hydroxide, NaOH, is dissolved in water, which species are present in addition to water?

Accepted Answer

A)  NaOH(aq) 
B)  Na+(aq)  and OH-(aq) 
C)  Na+(aq)  and H3O+ 
D)  Na+(aq)  and O2H22- 
E)  NaO-(aq)  and H3O+

Question 15

If CH3NH2 is added to water, what other compound could also be added in order to make a buffered solution?

Accepted Answer

A)  H2O
B)  NaOH
C)  CH3NH3Cl
D)  NaCH3NH2 
E)  none of these is correct

Question 16

What is the pH of a 0.020 M HCl solution?

Accepted Answer

A)  0.020
B)  1.70
C)  7.00
D)  12.30
E)  -1.70

Question 17

If you take an antacid tablet, the pH in your stomach will increase.This means your stomach juice becomes more acidic.

Accepted Answer

A) True 
 B)False

Question 18

List the species present in order of increasing concentration in a 0.1 M solution of H2C2O4.

Accepted Answer

A)  H2C2O4 2O4- 2O42- 
B)  H2C2O4 2O42- 2O4- 
C)  C2O42- 2O4- 2C2O4 
D)  HC2O4- 2O42- 2C2O4 
E)  C2O42- 2C2O4 2O4-

Question 19

Select the two Brønsted-Lowry bases in the following equation: NH3(aq)  + H2O(aq)  ⇌ NH4+(aq)  + OH-(aq)

Accepted Answer

A)  NH3 and H2O
B)  NH3 and OH- 
C)  H2O and OH- 
D)  NH3 and NH4+ 
E)  NH4+ and OH-

Question 20

Select the two Brønsted-Lowry bases in the following equation: CO32-(aq)  + H2O(l)  ⇌ HCO3-(aq)  + OH-(aq)

Accepted Answer

A)  CO32- and H2O
B)  CO32- and HCO3- 
C)  H2O and OH- 
D)  CO32- and OH- 
E)  H2O and HCO3-

Exam 13: Acids and Bases

Given 0.10 M solutions of the following acids, which contains the lowest concentration of H3O+?

Correct AnswerverifiedShow Answer

Calculate the pH of a solution that has [H3O+] = 5.9 x 10-5 M.

Correct AnswerverifiedShow Answer

Select the solution below that is the most acidic.

Correct AnswerverifiedShow Answer

List the acid, base, conjugate acid, and conjugate base, in that order, for the following reaction: HOCl(aq) + H2O(l) ⇌ OCl-(aq) + H3O+(aq)

Correct AnswerverifiedShow Answer

If you take an antacid tablet, the pH in your stomach will increase.This means your stomach juice becomes more acidic.

Correct AnswerverifiedShow Answer

Select the pair that consists of an acid and its conjugate base in that order.

Correct AnswerverifiedShow Answer

Which of the following is an amphoteric substance?

Correct AnswerverifiedShow Answer

When the following reaction goes in the reverse direction (from products to reactants) , what is the acid? HCN(aq) + H2O(l) ⇌ CN-(aq) + H3O+(aq)

Correct AnswerverifiedShow Answer

List the species present in order of increasing concentration in a 0.1 M solution of H2C2O4.

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Select the two Brønsted-Lowry bases in the following equation: NH3(aq) + H2O(aq) ⇌ NH4+(aq) + OH-(aq)

Correct AnswerverifiedShow Answer

Select the two Brønsted-Lowry bases in the following equation: CO32-(aq) + H2O(l) ⇌ HCO3-(aq) + OH-(aq)

Correct AnswerverifiedShow Answer

Select the solution below that is the most acidic.

Correct AnswerverifiedShow Answer

When sodium hydroxide, NaOH, is dissolved in water, which species are present in addition to water?

Correct AnswerverifiedShow Answer

Calculate the pH of a solution that has [H3O+] = 3.1 x 10-8 M.

Correct AnswerverifiedShow Answer

Which of the following ions is amphoteric?

Correct AnswerverifiedShow Answer

What is the pH of a 0.020 M HCl solution?

Correct AnswerverifiedShow Answer

In polyprotic acids, the first ionizable hydrogen always ionizes to a greater extent than the second or third ionizable hydrogen(s).

Correct AnswerverifiedShow Answer

Match the molecular-level diagrams to each of the following compounds in aqueous solution: HCl, HF, NH3

Correct AnswerverifiedShow Answer

If CH3NH2 is added to water, what other compound could also be added in order to make a buffered solution?

Correct AnswerverifiedShow Answer

Select the strong acid from the following list.

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Given 0.10 M solutions of the following acids, which contains the lowest concentration of H₃O⁺?

Correct Answer
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Calculate the pH of a solution that has [H₃O⁺] = 5.9 x 10^-5M.

Correct Answer
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List the acid, base, conjugate acid, and conjugate base, in that order, for the following reaction: HOCl(aq) + H₂O(l) ⇌ OCl^-(aq) + H₃O⁺(aq)

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When the following reaction goes in the reverse direction (from products to reactants) , what is the acid? HCN(aq) + H₂O(l) ⇌ CN^-(aq) + H₃O⁺(aq)

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List the species present in order of increasing concentration in a 0.1 M solution of H₂C₂O₄.

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Select the two Brønsted-Lowry bases in the following equation: NH₃(aq) + H₂O(aq) ⇌ NH₄⁺(aq) + OH^-(aq)

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Select the two Brønsted-Lowry bases in the following equation: CO₃^2-(aq) + H₂O(l) ⇌ HCO₃^-(aq) + OH^-(aq)

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Calculate the pH of a solution that has [H₃O⁺] = 3.1 x 10^-8M.

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Match the molecular-level diagrams to each of the following compounds in aqueous solution: HCl, HF, NH₃

Correct Answer
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If CH₃NH₂ is added to water, what other compound could also be added in order to make a buffered solution?

Correct Answer
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