Abstract

The Gibbs free energies for KClO3 were evaluated in mixed dimethylformamide (DMF)-H2O solvents at 301.15 K from the experimental
solubility measurements. From the experimental the ionic radii ratio of potassium to chlorate ions, the total free energy of the salt is divided
into its individual contribution in the mixtures used. Liberation Gibbs free energy for moving KClO3 from standard gas state to standard
solution state was calculated according to specific cycle for the solvation process using the solubility product. Also the lattice energy for
solid KClO3 (cr) was also calculated and used for further evaluation. The conventional Gibbs free energies for the cation (K+
) and the anion
(ClO3
-
) were estimated theoretically and also the Gibbs free energy of ClO3
- gas was evaluated and all values were discussed.

Key words: Gibbs free energy, solvation, potassium chlorate, aqueous dimethylformamide