摘要：The Gibbs free energies as very important thermodynamic property were evaluated for potassium thiocyanate (KSCN) in mixed ethanol (EtOH-H2O) solvents at 301.15 K from the experimental solubility measarments. The ratio of the ionic radii between potassium and thiocyanate ions was used to divide the total Gibbs free energy of the salt into its individual contribution in the mixtures used. Libration Gibbs free energy associated with moving KSCN in standard gas state to standard state in solution was evaluated according to specific cycle for the solvation process using the solubility products. Also the lattice energy for solid KSCN (Cr) was calculated and used for further evaluation. The conventional Gibbs free energies for the cation (K+) and anion (SCN-) were estimated theoretically and also the Gibbs free energy of (SCN-) gas was evaluated and all values were discussed. The present work is concerned with relative(conventional) and absolute Gibbs free energies of the solvation of ions used.
