Determination of the Activity Coefficients of LiCl in Polyhydric Alcohols–Water Mixtures at 298.15 K

Abstract

Thermodynamic properties of LiCl in mixed solvents composed of polyhydric alcohols and water are measured by using the potentiometric technique at 298.15 K. The polyhydric alcohols are 1,2-propanediol (PG), 1,2-ethanediol (EG), and 1,2,3-propanetriol (GL). Pitzer and extended Debye–Hückel equations are applied to correlate the experimental data. The mean activity coefficients, the osmotic coefficients, and the excess Gibbs free energies were calculated. Meanwhile, the standard free energy of transference from water to the mixtures, the standard solubility product, and the primary LiCl hydration number are also obtained.