SIMULTANEOUS CORRELATION OF ACTIVITY-COEFFICIENT AND PARTIAL THERMAL-PROPERTIES FOR ELECTROLYTE-SOLUTIONS USING A MODEL WITH ION-SPECIFIC PARAMETERS

The Liu-Harvey-Prausnitz model (1989a) for electrolyte solutions with ion-specific parameters is extended to simultaneously correlate the ac tivity coefficient, relative partial molal enthalpy and heat capacity of six aqueous electrolytes (HBr, HCl, KBr, KCl, LiBr and LiCl) over t he temperature range 0 - 110-degrees-C and the concentration range up to 21.55 m. An improved expression is proposed for the dielectric cons tant of aqueous electrolyte solutions over wide ranges of temperature and concentration. For comparison, a similar model (Liu et al., 1989b) is also applied to the simultaneous correlation. For both models, the calculated values agree well with experimental data.