SIMULTANEOUS CORRELATION OF ACTIVITY-COEFFICIENTS FOR 55 AQUEOUS-ELECTROLYTES USING A MODEL WITH ION SPECIFIC PARAMETERS

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 H2SO4/H2O system up to the H2SO4 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-, NO3-, CNS- and SO4--). 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.