Question 1

Calculate the pH of a solution that has [H3O+] = 5.2 × 10-7 M.

Accepted Answer

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

Question 2

The H3O+ concentration in a 0.050 M solution of HClO4 is 0.050 M.

Accepted Answer

A) True 
 B)False

Question 3

The symbol In- can be used to represent the base form of an indicator.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following equations represents the behavior of H2PO4- as an acid?

Accepted Answer

A) H2PO4-(aq)+ H3O+(aq)⇌ H3PO4(aq)+ H2O(l) 
B) H2PO4-(aq)+ HF(aq)⇌ H3PO4(aq)+ F-(aq) 
C) H2PO4-(aq)+ HCN(aq)⇌ H3PO4(aq)+ CN-(aq) 
D) H2PO4-(aq)+ OH-(aq)⇌ HPO42-(aq)+ H2O(l) 
E) H2PO4-(aq)+ H2O(l)⇌ H3PO4(aq)+ OH-(aq) 
A) H2PO4-(aq)+ H3O+(aq)⇌ H3PO4(aq)+ H2O(l) 
B) H2PO4-(aq)+ HF(aq)⇌ H3PO4(aq)+ F-(aq) 
C) H2PO4-(aq)+ HCN(aq)⇌ H3PO4(aq)+ CN-(aq) 
D) H2PO4-(aq)+ OH-(aq)⇌ HPO42-(aq)+ H2O(l) 
E) H2PO4-(aq)+ H2O(l)⇌ H3PO4(aq)+ OH-(aq)

Question 5

List the species present in order of increasing concentration in a 0.1 M solution of H2S.

Accepted Answer

A) H2S - 2- 
B) H2S 2- - 
C) S2- - 2S 
D) HS- 2- 2S 
E) S2- 2S - 
A) H2S - 2- 
B) H2S 2- - 
C) S2- - 2S 
D) HS- 2- 2S 
E) S2- 2S -

Question 6

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

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 
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 7

What is the pH of a 0.020 M KOH solution?

Accepted Answer

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

Question 8

The Ka for acetic acid is 1.8 × 10-5. Which of the following statements best describes the pH of a 0.010 M solution of acetic acid?

Accepted Answer

A) The pH is greater than 0 but less than 2. 
B) The pH is exactly 2. 
C) The pH is greater than 2 but less than 7. 
D) The pH is exactly 7. 
E) The pH is greater than 7 but less than 12. 
A) The pH is greater than 0 but less than 2. 
B) The pH is exactly 2. 
C) The pH is greater than 2 but less than 7. 
D) The pH is exactly 7. 
E) The pH is greater than 7 but less than 12.

Question 9

When the following reaction goes in the reverse direction (from products to reactants), what is the base? 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 10

The substance NH3(aq)is

Accepted Answer

A) a strong acid. 
B) a weak acid. 
C) a strong base. 
D) a weak base. 
E) neither an acid nor a base. 
A) a strong acid. 
B) a weak acid. 
C) a strong base. 
D) a weak base. 
E) neither an acid nor a base.

Question 11

Would you expect the pH of a 0.010 M solution of HF to be less than, greater than, or equal to 2.00? Explain.

Accepted Answer

To determine whether the pH of a 0.010 M

Question 12

Select the two Brønsted-Lowry bases in the following equation: CH3NH2(aq)+ H2O(l)⇌ CH3NH3+(aq)+ OH−(aq)

Accepted Answer

A) CH3NH2 and H2O 
B) CH3NH2 and OH− 
C) H2O and OH− 
D) CH3NH2 and CH3NH3+ 
E) CH3NH3+ and OH− 
A) CH3NH2 and H2O 
B) CH3NH2 and OH− 
C) H2O and OH− 
D) CH3NH2 and CH3NH3+ 
E) CH3NH3+ and OH−

Question 13

The image shows a molecular-level representation of part of a solution after HF is dissolved in water. (Besides water, there are 6 HF molecules, 1 H3O+ ion, and 1 F− ion present in the solution.)Which of the following best describes HF?

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 14

If the pOH of a coffee sample is 8.85, what is the H3O+ concentration in the coffee?

Accepted Answer

A) 5.2 M 
B) 7.1 × 10-8 M 
C) 7.1 × 10-7 M 
D) 7.1 × 10-6 M 
E) 8.8 M 
A) 5.2 M 
B) 7.1 × 10-8 M 
C) 7.1 × 10-7 M 
D) 7.1 × 10-6 M 
E) 8.8 M

Question 15

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 16

Calculate the pH of a solution that has [OH-] = 3.1 × 10-8 M.

Accepted Answer

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

Question 17

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

Calculate the pH of a solution that has [H₃O⁺] = 5.2 × 10^-7 M.

The H₃O⁺ concentration in a 0.050 M solution of HClO₄ is 0.050 M.

The symbol In^- can be used to represent the base form of an indicator.

Which of the following equations represents the behavior of H₂PO₄^- as an acid?

List the species present in order of increasing concentration in a 0.1 M solution of H₂S.

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

What is the pH of a 0.020 M KOH solution?

The K_a for acetic acid is 1.8 × 10^-5. Which of the following statements best describes the pH of a 0.010 M solution of acetic acid?

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

The substance NH₃(aq)is

Would you expect the pH of a 0.010 M solution of HF to be less than, greater than, or equal to 2.00? Explain.

Select the two Brønsted-Lowry bases in the following equation: CH₃NH₂(aq)+ H₂O(l)⇌ CH₃NH₃⁺(aq)+ OH⁻(aq)

The image shows a molecular-level representation of part of a solution after HF is dissolved in water. (Besides water, there are 6 HF molecules, 1 H₃O⁺ ion, and 1 F⁻ ion present in the solution.)Which of the following best describes HF?

If the pOH of a coffee sample is 8.85, what is the H₃O⁺ concentration in the coffee?

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

Calculate the pH of a solution that has [OH^-] = 3.1 × 10^-8 M.

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)

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

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

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Exam 13: Acids and Bases

Calculate the pH of a solution that has [H3O+] = 5.2 × 10-7 M.

The H3O+ concentration in a 0.050 M solution of HClO4 is 0.050 M.

The symbol In- can be used to represent the base form of an indicator.

Which of the following equations represents the behavior of H2PO4- as an acid?

List the species present in order of increasing concentration in a 0.1 M solution of H2S.

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

What is the pH of a 0.020 M KOH solution?

The Ka for acetic acid is 1.8 × 10-5. Which of the following statements best describes the pH of a 0.010 M solution of acetic acid?

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

The substance NH3(aq)is

Would you expect the pH of a 0.010 M solution of HF to be less than, greater than, or equal to 2.00? Explain.

Select the two Brønsted-Lowry bases in the following equation: CH3NH2(aq)+ H2O(l)⇌ CH3NH3+(aq)+ OH−(aq)

The image shows a molecular-level representation of part of a solution after HF is dissolved in water. (Besides water, there are 6 HF molecules, 1 H3O+ ion, and 1 F− ion present in the solution.)Which of the following best describes HF?

If the pOH of a coffee sample is 8.85, what is the H3O+ concentration in the coffee?

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

Calculate the pH of a solution that has [OH-] = 3.1 × 10-8 M.

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)

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

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Calculate the pH of a solution that has [H₃O⁺] = 5.2 × 10^-7 M.

The H₃O⁺ concentration in a 0.050 M solution of HClO₄ is 0.050 M.

The symbol In^- can be used to represent the base form of an indicator.

Which of the following equations represents the behavior of H₂PO₄^- as an acid?

List the species present in order of increasing concentration in a 0.1 M solution of H₂S.

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

The K_a for acetic acid is 1.8 × 10^-5. Which of the following statements best describes the pH of a 0.010 M solution of acetic acid?

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

The substance NH₃(aq)is

Select the two Brønsted-Lowry bases in the following equation: CH₃NH₂(aq)+ H₂O(l)⇌ CH₃NH₃⁺(aq)+ OH⁻(aq)

The image shows a molecular-level representation of part of a solution after HF is dissolved in water. (Besides water, there are 6 HF molecules, 1 H₃O⁺ ion, and 1 F⁻ ion present in the solution.)Which of the following best describes HF?

If the pOH of a coffee sample is 8.85, what is the H₃O⁺ concentration in the coffee?

Calculate the pH of a solution that has [OH^-] = 3.1 × 10^-8 M.

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)