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 𝐾b of 1.76×10?

  • A 1 . 3 1 %
  • B 0 . 5 6 0 %
  • C 0 . 1 1 7 %
  • D 2 . 0 0 %
  • E 2 . 3 3 %

Q3:

Consider the equilibrium for the ionization of acetic acid. CHCOH()+HO()HO()+CHCO()3223+32aqlaqaq

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, CHCOH32? Take 𝐾=1.8×10a.

Q4:

What is 𝐾a for the hydrogen sulfate ion, HSO4? In a 0.10 M solution, the acid is 29% ionized.

  • A0.41
  • B 1 . 2 × 1 0
  • C0.17
  • D 4 . 8 × 1 0
  • E2.9

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