Semi-empirical equation describing the temperature dependence of the standard Gibbs energy of solution, \[\Delta_{\rm{sln}}G^{^⦵\!}(T, p^{_{^⦵\!}})/RT = A_{0} + A_{1}(T_{\rm{ref}}/T) + A_{2}\ln(T/T_{\rm{ref}}) + A_{3}(T/T_{\rm{ref}}) + A_{4}(T/T_{\rm{ref}})^{2} + \ldots\] where the \(A_{i}\) are constants that can be related to thermodynamic quantities (but subject to uncertainty because of statistical correlations among the fitting coefficients) and \(T_{\rm{ref}}\) is a reference temperature.