dissociation constant

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A constant that describes the relationship of the activities (approximately, concentrations) of reactants and products in a chemical equilibrium of form A + B = AB. The dissociation constant, Kd, is the product of the activities of A and B divided by the activity of the product, AB, and has dimensions of concentration. The acid dissociation constant, Ka, is the special case where one of the reactants is a proton (H+) and is usually expressed as pKa (which is −log10Ka).

Subjects: Chemistry — Medicine and Health.

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