Vapor pressures and derived thermodynamic properties of aqueous Zn(NO3)2 solutions from 423.15 to 623.15 K

Vapor pressures of aqueous Zn(NO3)2 Solutions (0.321, 0.499, 0.900, 1.400 2.000, and 3.002 mol (.) kg(-1)) have been measured by the static method in the temperature range from 423.15 to 623.15 K with a constant-volume piezometer immersed in a precision liquid thermostat. The total uncertainty of temperature, pressure, and composition measurements were estimated to be less than 15 mK, 0.2%, and 0.014%, respectively. The vapor pressures of pure water were Measured to confirm the accuracy of the method for aqueous Zn(NO3)(2) Solutions taken using the apparatus and procedure in this study. The resulting measurements of PS - T-S for pure water were compared with values calculated from IAPWS formulation. Useful thermodynamic functions (water and electrolyte activities, osmotic coefficient, excess relative partial molar entropy, and relative partial molar enthalpy values of solvent) were derived using measured values of vapor pressure for the solutions and pure water.