Simultaneous correlation of activity coefficients for 55 aqueous electrolytes using a model with ion specific parameters

Abstract

The Liu-Harvey-Prausnitz model (1989a) for electrolyte solutions with ion-specific parameters is extended to simultaneously correlating the mean ionic activity coefficient data for 55 aqueous electrolytes including the H 2SO 4/H 2O system up to the H 2SO 4 concentration of 76 m. With only 1.6 adjustable parameters per aqueous electrolyte, an excellent agreement between the calculated values and the experimental data has been achieved. Ion-specific parameters are reported for 9 cations (H +, Li +, Na +, K +, Rb +, Cs +, Mg ++, Ca ++ and Zn ++) and 8 anions (F −, Cl −, Br −, I −, OH −, NO − 3, CNS − and SO − − 4). The results in this work are compared with those given by the Haghtalab-Vera model (1988) and the outcome is in favor of the Liu-Harvey-Prausnitz model.