Electrical Conductance, Density, and Viscosity in Mixtures of Alkali-Metal Halides and Glycerol

This paper presents the results of density, viscosity, and electrical conductivity measurements for glycerol solutions of some alkali-metal halides at 25°C. The apparent and partial molar volumes (VF and V1) in mixtures of KCl, NaCl, KBr, KI, and glycerol were calculated from the density data. The Debye–Hückel limiting law was assumed to be valid at low concentrations, and values of the molar volumes at infinite dilution were obtained by extrapolation. The viscosity data were analyzed by means of the Jones–Dole equation. The Kaminsky method, based on reference electrolyte (on BK+=BCl−), was used in glycerol. Viscosity B-coefficients are compared with those calculated applying existing theories based on the model of hard-charged spheres moving in a solvent continuum. Specific agreement between theory and experiment was not generally good. The electrical conductivities of solutions of salts (KCl, NaCl, KBr, NaBr, NaI, KI, and LiBr) in glycerol have been measured at three concentrations (approximately 0.01, 0.1, and 0.3 M) at 25°C. Values of the molar conductivity at infinite dilution were obtained by extrapolation using the conductance equation of Onsager. Using previously measured transference numbers for KCl and NaCl in glycerol, values of limiting Walden products for the individual alkalimetal and halide ions in glycerol have been derived and compared with those in aqueous and other alcohol solutions.