ION-SOLVENT INTERACTIONS OF SOME ALKALI-HALIDES IN GLYCEROL FROM DENSITY AND VISCOSITY DATA

This paper presents the results of density and viscosity measurements for glycerol solutions of KCl, NaCl, KBr, and KI at 25 degrees C. The apparent and partial molar volumes (V-Phi and V-I) mere calculated fro m the density data. The Debye-Huckel limiting law was assumed to be va lid at low concentrations, and values of the molar volumes at infinite dilution were obtained by extrapolation. The viscosity data were anal yzed by means of the Jones-Dole equation. The Kaminsky method, based o n BK+ = BCl-, developed for the separation of the B-coefficients in aq ueous solutions was used in glycerol. The ionic B-coefficients are dis cussed in terms of structure-making and structure-breaking properties of ions in glycerol. A comparison of molar volume data with viscosity data in glycerol shows that, as in aqueous solutions, the salt (NaCl) having the highest B-coefficient exhibits the smallest limiting appare nt molar volume V-Phi(infinity). Finally, the similarities of ion-solv ent interactions in water with those in glycerol and the effects that the solutes seem to have on both solvents are discussed.