Question 1

Given 0.10 M solutions of the following acids, which contains the highest 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 2

Which of the following statements regarding acids is incorrect?

Accepted Answer

A)  An acid will react with an active metal.
B)  An acid is a substance that will change the color of blue litmus paper.
C)  An acid is a substance that would taste sour.
D)  An acid is a substance that produces hydrogen ions, H+, (or H3O+) in aqueous solution.
E)  An acid is always a strong electrolyte.

Question 3

The H2PO4- ion is amphoteric. What are the conjugate acid and conjugate base, in that order, of H2PO4-?

Accepted Answer

A)  PO43-, H2PO4-
B)  H2PO4-, PO43-
C)  H2PO4-, H3PO4
D)  H3PO4, HPO42-
E)  H3O+, PO43-

Question 4

Which of the following is not an attribute of an acid?

Accepted Answer

A)  It provides H+ ions in aqueous solution.
B)  It is a nonelectrolyte.
C)  It tastes sour.
D)  It reacts with some organic dyes to cause them to change color.
E)  It reacts with active metals.

Question 5

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)  NaCl

Question 6

The image shows a molecular-level representation of part of a solution after HCl is dissolved in water. What best describes this image? (Besides water, there are 6 H3O+ ions and 6 Cl− ions present in the solution.) Which of the following best describes HCl? 3O+ ions and 6 Cl− ions present in the solution.) Which of the following best describes HCl?   A) strong acid B) strong base C) weak acid D) weak base E) amphoteric" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  strong acid
B)  strong base
C)  weak acid
D)  weak base
E)  amphoteric

Question 7

When acetate ion, CH3CO2−, reacts with water, what are the products?

Accepted Answer

A)  H+(aq) and OH−(aq) 
B)  CH3CO2+(aq) and OH−(aq) 
C)  CH3CO2+(aq) and H2O(aq) 
D)  CH3CO2+(aq) and H−(aq) 
E)  CH3CO2H(aq) and OH−(aq)

Question 8

The bicarbonate ion, HCO3-, is amphoteric. What are the conjugate acid and conjugate base, in that order, of HCO3-?

Accepted Answer

A)  CO32-, HCO3-
B)  HCO3-, CO32-
C)  CO32-, H2CO3
D)  H2CO3, CO32-
E)  H3O+, CO32-

Question 9

Calculate the pH of a solution that has [OH-] = 5.9 × 10-5 M.

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

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

Accepted Answer

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

Question 12

Given an OH- concentration of 1.0 × 10-6 M, calculate the H3O+ concentration, and then identify the solution as acidic, basic, or neutral.

Accepted Answer

A)  [H3O+] = 1.0 × 10-7, neutral
B)  [H3O+] = 1.0 × 10-6, acidic
C)  [H3O+] = 1.0 × 10-8, acidic
D)  [H3O+] = 1.0 × 10-8, basic
E)  [H3O+] = 1.0 × 10-6, basic

Question 13

Rank the following 0.100 M solutions in order of increasing H3O+ concentration: HCN, Ka = 6.2 × 10-10; NH4+, Ka = 5.6 × 10-10; CH3CO2H, Ka = 1.8 × 10-5

Accepted Answer

A)  HCN 4+ 3CO2H
B)  HCN 3CO2H 4+
C)  CH3CO2H 4+ 
D)  CH3CO2H 4+
E)  NH4+ 3CO2H

Question 14

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

Accepted Answer

A)  HF
B)  H2O
C)  F−
D)  H3O
E)  both F− and H3O

Question 15

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

Accepted Answer

A)  NH4+/NH2-
B)  CO32−/HCO3−
C)  CO32−/H2CO3−
D)  H2PO4-/H3PO4
E)  H2CO3/HCO3−

Question 16

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

Accepted Answer

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

Question 17

The Ka for formic acid is 1.8 × 10-4. Which of the following statements best describes the pH of a 0.0010 M solution of formic acid?

Accepted Answer

A)  The pH is greater than 0 but less than 3.
B)  The pH is exactly 3.
C)  The pH is greater than 3 but less than 7.
D)  The pH is exactly 7.
E)  The pH is greater than 7 but less than 11.

Question 18

Calculate the pH of a solution that has [H3O+] = 1.0 × 10-7 M.

Accepted Answer

A)  pH = 1.00
B)  pH = 7.00
C)  pH = 6.00
D)  pH = 8.00
E)  pH = 14.00

Question 19

Identify blood, pH = 7.4, as acidic, basic, or neutral.

Accepted Answer

Blood with a pH of 7.4 is considered to ...

Question 20

Which of the following equations represents the behavior of HCO3− as a base?

Accepted Answer

A)  HCO3−(aq) + H3O+(aq) ⇌ H2CO3(aq) + H2O(l) 
B)  HCO3−(aq) + F−(aq) ⇌ CO32−(aq) + HF(aq) 
C)  HCO3−(aq) + CN−(aq) ⇌ CO32−(aq) + HCN(aq) 
D)  HCO3−(aq) + OH−(aq) ⇌ CO32−(aq) + H2O(l) 
E)  HCO3−(aq) + H2O(l) ⇌ H2CO3(aq) + H3O+(aq)

Exam 13: Acids and Bases

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

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

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

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The bicarbonate ion, HCO3-, is amphoteric. What are the conjugate acid and conjugate base, in that order, of HCO3-?

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Which of the following statements regarding acids is incorrect?

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Which of the following equations represents the behavior of HCO3− as a base?

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The H2PO4- ion is amphoteric. What are the conjugate acid and conjugate base, in that order, of H2PO4-?

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Rank the following 0.100 M solutions in order of increasing H3O+ concentration: HCN, Ka = 6.2 × 10-10; NH4+, Ka = 5.6 × 10-10; CH3CO2H, Ka = 1.8 × 10-5

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The Ka for formic acid is 1.8 × 10-4. Which of the following statements best describes the pH of a 0.0010 M solution of formic acid?

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Given an OH- concentration of 1.0 × 10-6 M, calculate the H3O+ concentration, and then identify the solution as acidic, basic, or neutral.

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Calculate the pH of a solution that has [OH-] = 5.9 × 10-5 M.

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When acetate ion, CH3CO2−, reacts with water, what are the products?

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Which of the following is not an attribute of an acid?

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Calculate the pH of a solution that has [H3O+] = 1.0 × 10-7 M.

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The image shows a molecular-level representation of part of a solution after HCl is dissolved in water. What best describes this image? (Besides water, there are 6 H3O+ ions and 6 Cl− ions present in the solution.) Which of the following best describes HCl?

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Identify blood, pH = 7.4, as acidic, basic, or neutral.

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

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

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

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

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

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

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The bicarbonate ion, HCO₃^-, is amphoteric. What are the conjugate acid and conjugate base, in that order, of HCO₃^-?

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Which of the following equations represents the behavior of HCO₃⁻ as a base?

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The H₂PO₄^- ion is amphoteric. What are the conjugate acid and conjugate base, in that order, of H₂PO₄^-?

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Rank the following 0.100 M solutions in order of increasing H₃O⁺ concentration: HCN, K_a = 6.2 × 10^-10; NH₄+, K_a = 5.6 × 10^-10; CH₃CO₂H, K_a = 1.8 × 10^-5

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The K_a for formic acid is 1.8 × 10^-4. Which of the following statements best describes the pH of a 0.0010 M solution of formic acid?

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Given an OH^- concentration of 1.0 × 10^-6 M, calculate the H₃O⁺ concentration, and then identify the solution as acidic, basic, or neutral.

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Calculate the pH of a solution that has [OH^-] = 5.9 × 10^-5 M.

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When acetate ion, CH₃CO₂⁻, reacts with water, what are the products?

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Calculate the pH of a solution that has [H₃O⁺] = 1.0 × 10^-7 M.

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The image shows a molecular-level representation of part of a solution after HCl is dissolved in water. What best describes this image? (Besides water, there are 6 H₃O⁺ ions and 6 Cl⁻ ions present in the solution.) Which of the following best describes HCl?

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Blood with a pH of 7.4 is considered to ...
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Given 0.10 M solutions of the following acids, which contains the highest concentration of H₃O⁺?

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

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