AnswersCrowley Original Credit Chemistry BEquilibria of Acids and Bases

Equilibria of Acids and Bases Answers

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The acid-dissociation constants for three acids are shown in the table.Which is the strongest acid?phenol✔ formiclactic

A
phenol
B
✔ formic
C
lactic
2
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Which has the strongest conjugate base?✔ phenolformiclactic

A
✔ phenol
B
formic
C
lactic
3

The base-dissociation constants for three bases are shown in the table.Which is the weakest base?trimethylamine✔ hydrazinedimethylamine

A
trimethylamine
B
✔ hydrazine
C
dimethylamine
4

The acid-dissociation constant, Ka, for benzoic acid is 6.5 × 10-5.Which will you use to calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
5

The acid-dissociation constant, Ka, for benzoic acid is 6.5 × 10-5.Calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid.

A
9.3 × 105
B
2.5 × 10-6
C
6.5 × 109
D
1.5 × 10-10
6

The base-dissociation constant, Kb, for aniline is 4.3 × 10-10.What is the acid-dissociation constant for the conjugate acid of aniline?

A
2.3 × 10-5
B
9.5 × 10-4
C
4.3 × 105
D
7.5 × 10-11
7

Determine the pH of a 0.0500 M solution of potassium hydroxide (KOH). ⇒ 12.7

Answer:

12.7

8

Determine the pH of a 0.05 M solution of hydrocyanic acid (HCN). Hydrocyanic acid has an acid-dissociation constant of 4.9 × 10-10. ⇒ 5.3

Answer:

5.3

9

Which has the weakest conjugate acid?trimethylaminehydrazine✔ dimethylamine

A
trimethylamine
B
hydrazine
C
✔ dimethylamine

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