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Dissociation constant

(Science: chemistry) in a chemical equilibrium of form a _ B = ab, the equilibrium concentrations (strictly, activities) of the reactants are related such that a x B/AB = a constant, kd, the dissociation constant, that in this simplest case has the dimensions of concentration. When a is H, this is the acid dissociation constant often designated Ka and expressed as pKa (log10Ka).