# 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 .

• A3.01
• B1.99
• C2.63
• D2.14
• 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
• E

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 .