High-temperature thermodynamic properties of several 1:1 electrolytes

Comprehensive equations for the thermodynamic properties of aqueous NaI, CsF, CsCl, CsI, NaIO3, KIO3, CsIO3, KClO4, and HCl are generated by combining the heat capacity and density measurements reported by the first author with literature data for the enthalpy and Gibbs energy, or activity, as a function of molality at 298 K. The composition dependence is represented by the equations of Pitzer, which combine a theoretical form and Debye–Hückel terms with empirically evaluated parameters for short-range ion interactions. Temperature dependencies are represented by simple empirical equations, which should be reliable to 413 K or a little higher.