Hajar Akbarinezhad - Department of Chemistry, Faculty of Science University of Guilan, P., O. Box: ۱۹۱۴۱, Rasht, Iran
Bahram Ghalami-Choobar - Department of Chemistry, Faculty of Science University of Guilan, P., O. Box: ۱۹۱۴۱, Rasht, Iran
Parya Mossayyebzadeh-Shalkoohi

In many industrial and environmental processes, modeling the thermodynamic properties ofvarious electrolytes in water – organic solvent mixtures, is of particular interest. In this respect,the electromotive force (emf) method is a useful experimental technique for studying thethermodynamic properties of electrolyte solutions [1-3]. In this article, results from mean activitycoefficient measurements using the potentiometric method are reported for NaBr in various N,Ndimethylformamide+ water mixed solvent systems containing 0, 10, 20, and 30% mass fractionsof N,N- dimethylformamide over ionic strength ranging from 0.0100 to 2.0000 mol.kg−1. Pitzerion-interaction model was used to analyze the studied system. The obtained parameters wereapplied to calute the thermodynamic properties.

Activity Coefficient, Pitzer Model, Potentiometric Method, Thermodynamic Properties