Bahram Ghalami-Choobar - Department of Chemistry, Faculty of Science, University of Guilan, P.O.Box:۱۹۱۴۱, Rasht, Iran
Samaneh Mirzaie

In this paper, the results relating to the thermodynamic properties of ( KCl + proline + water ) system using the potentiometric method based on the electromotive force (EMF) measurements are reported.The modeling of this ternary system was made based on the Pitzer ion-interaction model in various mixed solvent systems containing 0, 2.5, 5.0, 7.5, 10.0 and 12.5 % mass fraction of proline over ionic strength ranging from 0.0010 to 3.9578 mol. kg -1 at T=(298.2 and 303.2)K. The resulting values of the mean activity coefficients and the excess Gibbs free energy together with Pitzer ion-interaction parameters ( β(0), β(1) and Cf ) for the series under investigated system are reported.

Gibbs free energy; Pitzer model; Potentiometric method; proline; KCl