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Abstract
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This work purpose is measuring and modeling of the ternary and quaternary systems consist of NaCl and
mixed NaClþKCl electrolyte in mixed solvents with different mass fractions (x) of C2H5OH in H2O, where
x ¼ 0.10, 0.20, 0.30, 0.40, and 0.50 and in the molality range of (0.0005e3.0) mol kg1. Based on
potentiometric measurement technique, the experimental data are obtained. A cell consists of a Naþglass
membrane and Ag/AgCl electrodes and series of electrolyte solutions, used to calculate the activity
coefficients at (298.15 ± 0.05) K. The quaternary system of mixed NaCl þ KCl electrolyte in mixed
C2H5OH þ H2O solvents is investigated by different molal salt ratios r (r ¼ mNaCl/mKCl ¼ 100, 150, 200 and
250). Modeling is implemented by using particularly, the Pitzer (P) and modified Pitzer by Merida et al.
(MP) equations. There is a good agreement between the results obtained from both models. The modified
Pitzer approach by Merida et al. permitted the determination of various binary ion-solvent and ternary
ion-ion-solvent interaction coefficients which represents complementary data to the usual Pitzer
interaction parameters for modeling the named electrolyte systems.
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