Abstract
Volume changes resulting from neutralization of 1-(aminoethyl)phosphonic acid and protonation of the anion of its bis(tetraethylammonium) salt were determined by the dilatometric method. Protonation constants, apparent molar volumes of the acid and its ionized forms, and volume changes on neutralization of the acid and protonation of its salt were calculated. The presence of the betaine form of the acid in solutions was detected. The rule of the constancy of the sum of the volume effects of the protonation and neutralization reactions was shown to be valid for conjugate acid-base pairs of dibasic acids.
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