Osmotic and Activity Coefficients of Aqueous Mixed-electrolytes of NaCl and NaPropionate at 298.15 K

This work purposes on isopiestic vapor pressure measurements at 298.15 K for the ternary system {yB NaPro+ yC NaCl}(aq). Measurements were made for both pure (binary) solutions and for the ternary solutions with various ionic strength fractions of NaPro ( 0.25, 0.50 and 0.75). 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.

Keywords:

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