The EMF data of different metal chlorides (2:1 electrolytes) were obtained by using a cell [MX Hg|MCl2 (m)|AgCl-Ag] at two temperatures. Stock solutions of metal chlorides (CoCl2, CuCl2 and ZnCl2) were prepared by weight in 1,4-dioxane-aqueous mixtures. There was a significant change in the EMF values with change of metal chloride, its concentration and solvents composition. The standard electrode potential (E°) values of the above cell were calculated from the measured EMF of these mixtures. The standard thermodynamic functions (ΔG°, ΔH° and ΔS°) and respective transfer parameters of MCl2 from water to 20, 45 and 70% dioxane-water mixtures were also evaluated. Equilibrium dissociation constants (K1 and K2) as well as the degrees of dissociation (α1 and α2) were obtained by iterative procedures. The data were analyzed in terms of solute-solvent interactions depending on standard and transfer thermodynamic parameters and mean activity coefficients (γ±) of electrolytes.
Bibliographical noteFunding Information:
D.C. Spah thanks the Korean Federation of Science and Technology (KOFST) and Yonsei University, Seoul for inviting him as a Visiting Scientist under the Brain Pool Program.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry