# Worksheet: Dissociation Constants and pH

In this worksheet, we will practice converting between the pH or pOH of a solution and the dissociation constants of dissolved acids and bases.

**Q1: **

Aniline is an amine that is used to manufacture dyes. It is isolated as aniline hydrochloride, , a salt prepared by the reaction of the weak base aniline and hydrochloric acid. What is the pH of a 0.233 M solution of aniline hydrochloride, to 3 significant figures? of aniline is

- A2.14
- B3.01
- C1.99
- D2.63
- E5.76

**Q2: **

Formic acid, , is the irritant that triggers the body’s reaction to ant stings.

What is the concentration of hydronium ions in a 0.534 M solution of formic acid? Take .

- A M
- B M
- C M
- D M
- E M

**Q3: **

What is the pH of a 0.25 M solution of trimethylamine, a weak base?

Take .

**Q4: **

What is the concentration of hydroxide ions in a 0.0325 M solution of ammonia, a weak base with a of ?

- A M
- B M
- C M
- D M
- E M

**Q5: **

The pH of a 0.0516 M solution of nitrous acid () is 2.34. Calculate the of nitrous acid to 2 significant figures.

- A
- B
- C
- D
- E

**Q6: **

The pH of a solution of household ammonia, a 0.950 M solution of is 11.612. What is for to 2 significant figures?

- A
- B
- C
- D

**Q7: **

Sodium bisulfate () is used in some househould cleaners because it contains the ion, which is weakly acidic: The of is . Calculate to 2 decimal places the pH of a solution with a concentration of 0.50 M.

**Q8: **

Caffeine, a weak base, has a value of . Calculate to 1 decimal place the pH of a 0.010 M aqueous caffeine solution.

**Q9: **

The of is . Calculate to 1 decimal place the pH of a 0.083 M solution of .

**Q10: **

Aluminum chloride dissolves completely to produce the hydrated aluminum ion , which behaves as a monoprotic acid. The of is . Calculate to 2 decimal places the pH of a 0.10 M solution of aluminum chloride.

**Q11: **

The pH of a 0.15 M solution of is 1.43. What is for from these data?

- A
- B
- C
- D
- E

**Q12: **

The pH of a solution of household ammonia, a 0.950 M solution of , is 11.612. What is for from these data?

- A
- B
- C
- D
- E0.950

**Q13: **

White vinegar is a 5.00% by mass solution of acetic acid in water. If the density of white vinegar is 1.007 g/mL, what is the pH at ? The of acetic acid is .