Definition of Acid dissociation constant

General Chemistry Glossary
acid dissociation constant (acid ionization constant)
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(Ka) 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 HC2H3O2(aq) H+(aq) + C2H3O2-(aq), which is Ka = [H+][C2H3O2-]/[HC2H3O2].

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Acid dissociation constant Definition from Encyclopedia Dictionaries & Glossaries

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Acid dissociation constant
An acid dissociation constant, denoted by Ka, is an equilibrium constant for the dissociation of a weak acid. According to the Brønsted-Lowry theory of acids and bases an acid is only recognised by its reaction with a base. In aqueous solution, the base is water itself.
HA +H2O A- + H3O+
Acid dissociation constants are also known as the acidity constant or the acid-ionization constant. The term is also used for pKa, which is equal to minus the decimal logarithm of Ka (cologarithm of Ka).

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