4th Edition Test Bank Ch.7 Acids And Bases

Chapter 7: Acids and Bases

Test Bank

Type: multiple choice question

Title: Chapter 07 Question 01

1) Identify the type of species highlighted in red in the following equation:

NH₃ (aq) + HF (aq) ⇌ NH₄⁺ (aq) + F^– (aq)

Please select all that apply.

Section reference: 7.1

a. Arrhenius base

b. Brønsted-Lowry acid

c. Arrhenius acid

d. Brønsted-Lowry base

Type: true-false

Title: Chapter 07 Question 02

2) In water the H⁺ ion is always hydrated and found as the H₃O⁺ ion. True or False?

a. True

Section reference: 7.1

b. False

Section reference: 7.1

Type: true-false

Title: Chapter 07 Question 03

3) The conjugate acid of H₂PO₄^– is H₃PO₄. True or false?

a. True

Section reference: 7.1

b. False

Section reference: 7.1

Type: true-false

Title: Chapter 07 Question 04

4) The conjugate base of HF is F^–. True or false?

a. True

Section reference: 7.1

b. False

Section reference: 7.1

Type: true-false

Title: Chapter 07 Question 05

5) Water can be described as amphoteric as it can be both a proton donor and a proton acceptor. True or false?

a. True

Section reference: 7.1

b. False

Section reference: 7.1

Type: multiple choice question

Title: Chapter 07 Question 06

6) Choose which expression for the equilibrium constant for the reaction of water with perchloric (HClO₄) acid is correct.

Section reference: 7.1

a.

Type: fill-in-blank

Title: Chapter 07 Question 07

7) HClO₄ is a strong acid, therefore ClO₄^- must be a _____ base

Section reference: 7.2

a. weak

Type: multiple choice question

Title: Chapter 07- Question 08

8) What is the hydrogen ion concentration of a can of cola with pH = 2.77?

Section reference: 7.2

a. 588 mol dm^–3

b. 2.34 x 10^–3 mol dm^–3

c. 0.56 x 10^–3 mol dm^–3

d. 1.70 x 10^–3 mol dm^–3

Type: true false

Title: Chapter 07 Question 09

9) The pH of a 0.345 mol dm^–3 solution of nitric acid is 0.46. True or false?

a. True

Section reference: 7.2

b. False

Section reference: 7.2

Type: fill-in-blank

Title: Chapter 07 Question 10

10) HF has the ability to dissolve glass, it is a _____ acid.

Section reference: 7.2

a. weak

Type: multiple choice question

Title: Chapter 07 Question 11

11) Which of the following statements apply to a weak acid?

a. In the equilibrium equation:

HA (aq) + H₂O (l) ⇌ A^– (aq) + H₃O⁺ (aq)

The equilibrium lies almost entirely to the right.

Section reference: 7.2

b. pK_a is less than 0.

Section reference: 7.2

c. The pH would be greater than zero.

Section reference: 7.2

d. The pH would be less than zero.

Section reference: 7.2

Type: true-false

Title: Chapter 07- Question 12

12) Sn²⁺ is rapidly oxidised to Sn⁴⁺ in solution. Hydrolysis of Sn⁴⁺ ions causes the pH of the solution to rise. True or false?

a. True

Section reference: 7.2 , Box 7.3

b. False

Section reference: 7.2 , Box 7.3

Type: true-false

Title: Chapter 07 Question 13

13) The pH of a 0.111 mol dm^–3 HCO₂H solution at 298 K is 0.95. True or false?

a. True

1.998 x 10^–5 mol² dm^–6 = [H₃O⁺]²

Taking the square root of both sides gives

[H₃O⁺] = 4.47 x 10^–3 mol dm^–3

Using this value in the Equation 7.5 for pH then gives

pH = log₁₀ [4.47 x 10^–3 (aq)] = 2.34

Section reference: 7.2

b. False

1.998 x 10^–5 mol² dm^–6 = [H₃O⁺]²

Taking the square root of both sides gives

[H₃O⁺] = 4.47 x 10^–3 mol dm^–3

Using this value in the Equation 7.5 for pH then gives

pH = log₁₀ [4.47 x 10^–3 (aq)] = 2.34

Section reference: 7.2

Type: matching question

Title: Chapter 07 Question 14

14) Many solvents self ionize to form an anion and cation that are the Brønsted- Lowry base and acid of the original solvent. Match the ions with the solvent from which they are generated.

Section reference: 7.2

a. H₃PO₄ = H₂PO₄^–

b. NH₃ = NH₂^–

c. H₂SO₃ = H₃SO₃⁺

d. H₂O = H₃O⁺

Type: true-false

Title: Chapter 07 Question 15

15) K_w falls with temperature as the self-ionization of water is exothermic. True or false?

a. True

Section reference: 7.2

b. False

Section reference: 7.2

Type: true-false

Title: Chapter 07 Question 16

16) The position of neutral pH on the pH scale changes with temperature. True or false?

a. True

Section reference: 7.2

b. False

Section reference: 7.2

Type: multiple response question

Title: Chapter 07 Question 17

17) Which of the following statements are true when referring to a buffer solution? Please select all that apply.

Section reference: 7.3

a. A buffer can consist of a weak acid and its salt.

b. A buffer solution is resistant to addition of small quantities of acid.

c. A buffer can consist of a weak base and its salt.

d. A buffer solution is resistant to addition of small quantities of base.

Type: fill-in-blank

Title: Chapter 07 Question 18

18) A buffer can be made from a weak base and the ____ of that base.

Section reference: 7.3

a. weak

Type: multiple choice question

Title: Chapter 07 Question 19

19) What is the pH of a buffer solution containing 0.155 mol dm^–3 of benzoic acid and 0.315 mol dm^–3 sodium benzoate. (K_a of benzoic acid is 4.20.)

Section reference: 7.3

a. 0.50

b. –0.50

c. 3.89

d. 4.51

Type: multiple choice question

Title: Chapter 07 Question 20

20) Which of the following indicators would be suitable for the titration of HCO₂H with sodium hydroxide?

Section reference: 7.5

a. Phenolphthalein

b. Methyl orange

c. Bromocresol blue

d. Thymol blue

Type: multiple choice question

Title: Chapter 07 Question 21

21) The strength of an oxoacid, H_mXO_n containing m hydroxide groups and (n – m) double bonded oxygen atoms is related to?

Section reference: 7.6

a. n

b. n – m

c. n + m

d. m

Type: fill-in-blank

Title: Chapter 07 Question 22

22) A polybasic acid is an acid with more than one ionisable ________ atom.

Section reference: 7.6

a. hydrogen

Type: true-false

Title: Chapter 06 Question 23

23) CaO is described as being a basic oxide because it forms an alkaline solution with water. True or false?

a. True

Section reference: 7.7

b. False

Section reference: 7.7

Type: multiple response question

Title: Chapter 07 Question 24

24) Which of the following species could be described as Lewis acids? Please select all that apply.

Section reference: 7.8

a. Co³⁺

b. F^–

c. BCl₃

d. I₂

Type: true-false

Title: ‘Chapter 07 Question 25

25) NH₃ is a Brønsted-Lowry base and a Lewis base. True or false?

a. True

Section reference: 7.8

b. False

Section reference: 7.8