Isopiestic study of Aqueous Mixed-electrolyte of NaCl and NaButyratre at 298.15 K

This work purposes on isopiestic vapor pressure measurements at 298.15 K for the ternary system {yB NaButyr+ yC NaCl}(aq). Measurements were made for both pure solutions and for the mixed solutions with various ionic strength fractions of NaButyr ( 0, 0.25, 0.50 , 0.75 and 1 ). The experimental results were treated by extended forms of Pitzer and McKay-Perring methods. Based on the optimized values of the interaction parameters of Pitzer model, activity coefficients of the both constituent salts were calculated and compared well with those evaluated by McKay-Perrig method. Finally semi-ideally behavior of this system has been interpreted in terms of Zdanovskii's rule.

Keywords:

Osmotic coefficients , Activity coefficients , Isopiestic , Mixed-electrolyte , Sodium chloride , Sodium Butyrate