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, CHCOH?
CH₃CO₂H(aq) + H₂O(i) ⇌ H₃O⁺(aq) + CH₃CO₂⁻(aq) Kₐ = 1.8 x 10⁻⁵