Question 1

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

Question 2

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

Question 3

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 
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 4

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 
A) H2O 
B) NaOH 
C) CH3NH3Cl 
D) NaCH3NH2 
E) NaCl

Question 5

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

Question 6

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

Question 7

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?

Accepted Answer

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

Question 8

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. 
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 9

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

Question 10

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

Accepted Answer

Blood with a pH of 7.4 is considered to

Question 11

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

Question 12

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) 
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 13

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. 
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 14

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 
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 15

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

Question 16

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

Question 17

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) 
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)

Question 18

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

Question 19

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

Question 20

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. 
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.

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

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

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

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

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

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

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?

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

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

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

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

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

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?

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

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

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)

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

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)

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

Which of the following statements regarding acids is incorrect?

Matter and Energy

Atoms, Ions, and the Periodic Table

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Oxidation-Reduction Reactions

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Exam 13: Acids and Bases

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

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

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

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

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

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

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?

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

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

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

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

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

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?

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

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

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)

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

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)

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

Which of the following statements regarding acids is incorrect?

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Quantities in Chemical Reactions

Electron Structure of the Atom

Chemical Bonding

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The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

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

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

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

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

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?

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

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

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

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?

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

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)

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

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)

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