Question 1

Select the two Brønsted-Lowry acids in the following equation: HNO2(aq) + H2O(l) ⇌ NO2−(aq) + H3O+(aq)

Accepted Answer

A)  HNO2 and H2O
B)  HNO2 and NO2−
C)  HNO2 and H3O+
D)  H2O and H3O+
E)  NO2− and H3O+

Question 2

Select the two Brønsted-Lowry acids in the following equation: CO32-(aq) + HF(aq) ⇌ HCO3-(aq) + F-(aq)

Accepted Answer

A)  CO32- and HF
B)  CO32- and HCO3-
C)  HF and F-
D)  CO32- and F-
E)  HF and HCO3-

Question 3

Which of the following is an amphoteric substance?

Accepted Answer

A)  NaOH
B)  LiCl
C)  CsBr
D)  H2O
E)  CH4

Question 4

If the pH of a certain soft drink is 3.60, what is the H3O+ concentration in the soft drink?

Accepted Answer

A)  3.6 M
B)  2.5 × 10-3 M
C)  2.5 × 10-5 M
D)  2.5 × 10-4 M
E)  10. M

Question 5

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 6

Select the solution below that is the most acidic.

Accepted Answer

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

Question 7

The conjugate acid of HCO3− is:

Accepted Answer

A)  H2CO3
B)  HCO2−
C)  CO32−
D)  CO2
E)  H3CO3+

Question 8

Which of the following ions is amphoteric?

Accepted Answer

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

Question 9

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

Accepted Answer

A)  NH4+/NH3
B)  HCO3−/CO32−
C)  HCO3−/H2CO3
D)  H3PO4/ HPO42−
E)  CO32−/CO22−

Question 10

List the species present in order of increasing concentration in a 0.1 M solution of H2Se.

Accepted Answer

A)  H2Se 2−
B)  H2Se 2− −
C)  Se2- 2Se
D)  HSe- 2- 2Se
E)  Se2− 2Se −

Question 11

Select the solution below that is the most basic.

Accepted Answer

A)  [OH-] = 1.0 × 10-10 M
B)  [OH-] = 1.0 × 10-4 M
C)  [H3O+] = 1.0 × 10-6 M
D)  [H3O+] = 1.0 × 10-7 M
E)  [H3O+] = 1.0 × 10-9 M

Question 12

Calculate the pH of a solution that has [OH-] = 5.2 × 10-7 M.

Accepted Answer

A)  pH = 5.20
B)  pH = 7.00
C)  pH = 6.28
D)  pH = 5.27
E)  pH = 7.72

Question 13

The conjugate acid of H2PO4− is:

Accepted Answer

A)  HPO42−
B)  H2PO3−
C)  H3PO4
D)  PO43−
E)  H3PO3

Question 14

All of the following species are weak bases except:

Accepted Answer

A)  NH3(aq) 
B)  Na2CO3(aq) 
C)  KF(aq) 
D)  CH3NH2(aq) 
E)  NH4Cl(aq)

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

A)  HNO2, Ka = 5.6 × 10−4
B)  HCN, Ka = 6.2 × 10−10
C)  NH4+, Ka = 5.6 × 10−10
D)  CH3CO2H, Ka = 1.8 × 10−5
E)  HCO2H, Ka = 1.8 × 10−4

Question 17

Rank the following 0.100 M solutions in order of increasing H3O+ concentration: HF, Ka = 6.3 × 10−4; HCN, Ka = 6.2 × 10−10; HOCl, Ka = 4.0 × 10−8

Accepted Answer

A)  HF 
B)  HF 
C)  HOCl 
D)  HOCl 
E)  HCN < HOCl < HF

Question 18

If the pOH of an orange juice sample is 10.38, what is the H3O+ concentration in the orange juice?

Accepted Answer

A)  10. M
B)  2.4 × 10-4 M
C)  2.4 × 10-10 M
D)  4.2 × 10-11 M
E)  3.6 M

Question 19

Select the solution below that is the most acidic.

Accepted Answer

A)  [H3O+] = 1.0 × 10-4 M
B)  [H3O+] = 1.0 × 10-6 M
C)  [H3O+] = 1.0 × 10-7 M
D)  [H3O+] = 1.0 × 10-8 M
E)  [H3O+] = 1.0 × 10-10 M

Question 20

Rank the following 0.100 M solutions in order of increasing H3O+ concentration: HOCl, Ka = 4.0 × 10−8; HCN, Ka = 6.2 × 10−10; NH4+, Ka = 5.6 × 10−10

Accepted Answer

A)  HOCl 4+
B)  HOCl 4+ 
C)  HCN 4+ 
D)  HCN 4+
E)  NH4+ < HCN < HOCl

Exam 13: Acids and Bases

All of the following species are weak bases except:

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Which of the following is an amphoteric substance?

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Select the solution below that is the most acidic.

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Rank the following 0.100 M solutions in order of increasing H3O+ concentration: HF, Ka = 6.3 × 10−4; HCN, Ka = 6.2 × 10−10; HOCl, Ka = 4.0 × 10−8

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List the species present in order of increasing concentration in a 0.1 M solution of H2Se.

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

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What is the pH of a 0.020 M HCl solution?

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Select the two Brønsted-Lowry acids in the following equation: HNO2(aq) + H2O(l) ⇌ NO2−(aq) + H3O+(aq)

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

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Which of the following ions is amphoteric?

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Select the two Brønsted-Lowry acids in the following equation: CO32-(aq) + HF(aq) ⇌ HCO3-(aq) + F-(aq)

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If the pH of a certain soft drink is 3.60, what is the H3O+ concentration in the soft drink?

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The conjugate acid of H2PO4− is:

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Rank the following 0.100 M solutions in order of increasing H3O+ concentration: HOCl, Ka = 4.0 × 10−8; HCN, Ka = 6.2 × 10−10; NH4+, Ka = 5.6 × 10−10

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The conjugate acid of HCO3− is:

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If the pOH of an orange juice sample is 10.38, what is the H3O+ concentration in the orange juice?

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

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Select the solution below that is the most acidic.

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Calculate the pH of a solution that has [OH-] = 5.2 × 10-7 M.

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Select the solution below that is the most basic.

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Rank the following 0.100 M solutions in order of increasing H₃O⁺ concentration: HF, K_a = 6.3 × 10⁻⁴; HCN, K_a = 6.2 × 10⁻¹⁰; HOCl, K_a = 4.0 × 10⁻⁸

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List the species present in order of increasing concentration in a 0.1 M solution of H₂Se.

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

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Select the two Brønsted-Lowry acids in the following equation: HNO₂(aq) + H₂O(l) ⇌ NO₂⁻(aq) + H₃O⁺(aq)

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

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Select the two Brønsted-Lowry acids in the following equation: CO₃^2-(aq) + HF(aq) ⇌ HCO₃^-(aq) + F^-(aq)

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If the pH of a certain soft drink is 3.60, what is the H₃O⁺ concentration in the soft drink?

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The conjugate acid of H₂PO₄⁻ is:

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Rank the following 0.100 M solutions in order of increasing H₃O⁺ concentration: HOCl, K_a = 4.0 × 10⁻⁸; HCN, K_a = 6.2 × 10⁻¹⁰; NH₄⁺, K_a = 5.6 × 10⁻¹⁰

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The conjugate acid of HCO₃⁻ is:

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If the pOH of an orange juice sample is 10.38, what is the H₃O⁺ concentration in the orange juice?

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Calculate the pH of a solution that has [OH^-] = 5.2 × 10^-7 M.

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