Abstract
The fitting of experimental osmotic and activity coefficient values to Pitzer equations requires the use of a large number of adjustable parameters when polar neutral species are present in the system. This is because the Pitzer equations consider the λ ion—neutral and λ neutral—neutral as constant interaction parameters for the fitting. The modification of the original Pitzer equations, by considering the dependence of these binary interaction parameters concerning the polar neutral components, on both the ionic strength and the neutral species concentration in the system, leads to a considerable improvement in these fittings. To test the applicability of these modified Pitzer equations, they were used to fit several series of data from the literature, related to pure aqueous solutions of different amino acids, or urea, as well as aqueous mixtures of an electrolyte plus an amino acid, or urea.
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