Worksheet: Degrees of Ionization

In this worksheet, we will practice calculating the degrees of ionization of weak acids and bases from their dissociation constants.

Q1:

To 2 significant figures, what is the percent ionization of a 0.10 M solution of acetic acid with a pH of 2.89?

Q2:

What is the percentage ionization of ammonia in a 0.0325 M solution of ammonia, a weak base with a 𝐾 b of 1 . 7 6 × 1 0 5 ?

  • A0.560%
  • B0.117%
  • C1.31%
  • D2.33%
  • E2.00%

Q3:

Consider the equilibrium for the ionization of acetic acid:

Only a small fraction of a weak acid ionizes in aqueous solution. What is the percent ionization of acetic acid in a 0.100 M solution of acetic acid, C H C O H 3 2 ? Take 𝐾 = 1 . 8 × 1 0 a 5 .

Q4:

What is 𝐾 a for the hydrogen sulfate ion, H S O 4 ? In a 0.10 M solution, the acid is 29% ionized.

  • A0.41
  • B0.17
  • C 4 . 8 × 1 0
  • D 1 . 2 × 1 0
  • E2.9

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