Activity Coefficients and Solubilities of the System (Ag/Cs)NO_3_H_2O from Vapour Pressure Measurements

摘要

Vapour pressures of water over (Ag/Cs)NO_3-H_2O (0, 40, 60, and 100/100 AgNO_3) are reported at three tempera- ture: 152, 179, and 218 deg. C. The water activities derived from these data are fitted with equations for multicompo- nent electrolyte solutions developed by Van Laar and Pitzer (three models: Van Laar model, Pitzer-Van Laar model, Pitzer-Simonson model). With these models the mean activity coefficients of the salts and the solubilities of the pure salt components (AgNO_3 or CsNO_3) in the ternary mixture are calculated. The advantages of the Pitzer-Simonson model are underlined.