ionization constant

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ionization constant

[‚ī·ə·nə′zā·shən ¦kän·stənt]
(physical chemistry)
Analog of the dissociation constant, where k = [H+][A-]/[HA]; used for the application of the law of mass action to ionization; in the equation HA represents the acid, such as acetic acid.
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Acid dissociation constants of the thiohydantoin-pyrrolidine compounds containing methyl ester group as a substituent (1a-g), prepared according to the literature method [25], were determined potentiometrically at 25.0 ([+ or -] 0.1)[degrees]C in a 20% (v/v) ethanol-water mixture.
Acid dissociation constants were potentiometrically obtained from several series of independent measurements.
Computer programs using data from multiwavelenght spectrophotometry are frequently used for the determination of acid dissociation constants [19, 20].