Jones-Dole Coefficients of Electrolyte Solutions of Zncl\(_2\) in Mixtures of Propylene-Carbonate and 1,2-Dimethoxyethane

Abstract

The paper reports the contrasting impact of non-bonding electrostatic interactions - dipole-dipole and ion-dipole interactions in ZnCl2 electrolytes; prepared in mixed solvents of propylene carbonate and 1,2-Dimethoxyehane. The organic electrolyte solutions were constituted by incorporating ZnCl2 salts in the mixed solvents at concentrations of 0.01 M, 0.05 M and 0.10 M at 298.15 K. Density and viscosity measurements were determined at different solvent compositions at 298.15 K. The viscosity of pure solvents ranged from 2.080 to 1.042 cP over the composition (0-100% DME). For the solutions 0.01 M, 0.05 M and 0.10 M ZnCl2, the viscosities ranged from 2.301 to 0.901 cP, 2.902 to 1.037 cP and 3.697 to 1.185 cP respectively for the composition range (0-100% DME). The viscosity data was fitted to the Jones-Dole equation and coefficient values for A and B extrapolated from plots of of (\(\eta\) r − 1)/\(\sqrt{C}\) versus \(\sqrt{C}\). The values of the A coefficients were positive over the composition range, confirming the presence of ion interactions. The B coefficient values were also positive over the composition range, confirming the presence of ion-dipole interactions. The A coefficient values decreased from 0.784 to 0.079 over the composition (0-100% DME). The B coefficient values increased from 5.033 to 5.775 and from 5.436 to 5.623 over the composition (0-25% DME) and (50-75% DME) respectively. The B coefficient values decreased from 5.775 to 5.436 and from 5.623 to 3.490 over the composition (25-50% DME) and (75-100% DME) respectively.