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(K a ) Compare with base hydrolysis constant .The equilibrium constant for the dissociation of an acid into a hydrogen ion and an anion. For example, the acid dissociation constant for acetic acid is the equilibrium constant for HC 2 H 3 O 2 (aq) H + (aq) + C 2 H 3 O 2 - (aq), which is K a = [H + ][C 2 H 3 O 2 - ]/[HC 2 H 3 O 2 ].