Common-ion Effect

Examples

• If both sodium acetate and acetic acid are dissolved in the same solution they both dissociate and ionize to produce acetate ions. Sodium acetate is a strong electrolyte so it dissociates completely in solution. Acetic acid is a weak acid so it only ionizes slightly. According to Le Chatelier's principle, the addition of acetate ions from sodium acetate will suppress the ionization of acetic acid and shift its equilibrium to the left.

NaC₂H₃O_2(s) → Na⁺_(aq) + C₂H₃O₂^-_(aq)

HC₂H₃O_2(l) ↔ H⁺_(aq) + C₂H₃O₂^-_(aq)

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