Ali Ebrahimian Pirbazari - Department of Chemistry, Azarbaijan University of tarbiat moallem, Tabriz Ebrahimianali۲۰۰۲@yahoo. Com
Jaber Jahanbin Sardroodi - Department of Chemistry, Azarbaijan University of tarbiat moallem, Tabriz Ebrahimianali۲۰۰۲@yahoo. Com

The osmotic coefficients of solutions of LiN03 and 2-naphthol in ethanol have been measured by the isopiestic method. The experimental osmotic coefficient data were correlated using the Non-Random Two Liquid model (NRTL) and Clegg- Pitzer- Simonson model (C.P.S). The models give reliable results for the correlation of the osmotic coefficient data. The parameters of the considered models obtained by the correlation of osmotic coefficients.

Osmotic coefficients, Isopiestic method, NRTL model, C.P.S model.