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Medical Definition of PK2
1. The negative logarithm of the ionization constant (Ka) of an acid; the pH at which equal concentrations of the acid and conjugate base forms of a substance (often a buffer) are present. (05 Mar 2000)
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1. The negative logarithm of the ionization constant (Ka) of an acid; the pH at which equal concentrations of the acid and conjugate base forms of a substance (often a buffer) are present. (05 Mar 2000)