Definition: The acid dissociation constant is the equilibrium constant of the dissociation reaction of an acid and is denoted by Ka.
Examples:
The acid dissociation constant, Ka of the acid HB:
HB(aq) ↔ H+(aq) + B-(aq)
Ka = [H+][B-] / [HB]
Acid Dissociation Constant Definition - Ka - Chemistry Glossary Definition
By Anne Marie Helmenstine, Ph.D., About.com Guide
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