| dc.description.abstract | In the study of Lin and Lee (Fluid Phase Equilibria, vol.205, (2003) 69-83), it was concluded that, in the electrolyte solution, the ion activity coefficient is contributed by two parts: one is solvation which is expressed by solvation parameter, the other is ion-ion interaction which is expressed by approaching parameter. In this study, the Lin and Lee ‘s two-parameter individual ion activity coefficient model was adopted to regress the Vera’s experimental data measured with ISEs (AIChE J., vol.50 (2004) 445-462). The individual-ion-activity-coefficient parameters of 22 electrolytes, including 14 electrolytes of 1:1 type, 2 electrolytes of 1:2 type and 6 electrolytes of 2:1 type, were obtained. Using these parameters, the osmotic coefficients of aqueous uni-electrolyte solutions and the mean activity coefficients and osmotic coefficients of aqueous multi-electrolyte solutions have been predicted successfully. Even more, the individual ion activity coefficient of certain an ion in the aqueous multi-electrolyte solution can also be predicted.
Furthermore, the two-parameter individual ion activity coefficient model was adopted to regress the experimental data of osmotic coefficients of aqueous bi-electrolyte solutions containing common ions. The individual-ion-activity-coefficient parameters of 12 electrolytes, including 2 electrolytes of 1:1 type, 5 electrolytes of 2:1 type, 3 electrolytes of 1:2 type and 2 electrolytes of 2:2 type, were obtained. Using these parameters, the osmotic coefficients of aqueous uni-electrolyte solutions and the mean activity coefficients and osmotic coefficients of aqueous multi-electrolyte solutions, and the individual ion activity coefficient of certain an ion in the aqueous multi-electrolyte solution have been predicted successfully.
Heat capacity is an important thermodynamic property of aqueous electrolyte solutions. In this study, the predictive model of heat capacity of aqueous electrolyte solutions was also deduced by using the solution excess property and Lin and Lee’s two-parameter individual ion activity coefficient model, and, using the above regressed parameters, the heat capacities of 28 aqueous electrolyte solutions has been successfully predicted. | en_US |