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Acid−base equilibrium constants for the two amino groups of the procaine molecule have been determined at 25 °C in different saline media (NaCl, KCl, and CaCl2), by means of potentiometric titrations. The Pitzer model has been used to deal with the ionic strength dependence of activity coefficients, and the parameters proposed by this theory have been obtained, including the thermodymanic dissociation constants, pK T. Equations describing the dependence of stoichiometric acid−base equilibrium constants versus ionic strength are given.

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