dissociation constant
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).

Dictionary of molecular biology. 2004.

Look at other dictionaries:

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  • acid dissociation constant — the dissociation constant describing the ionization of an acid. Symbol Ka. For an acid HA …   Medical dictionary

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