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Densities and electrical conductivities were measured for the ternary systems NaCl-mannitol(CHO)-HO, KCl-glycine(NHCHCOOH)-HO, KCl-mannitol-HO, and NaBr-mannitol-HO at 298.15 K. Densities of the binary systems KCl-HO, NaBr-HO, glycine-HO and conductivities of the binary system NaBr-HO at 298.15 K were also measured. The measured densities were used to check the predictions of the semi-ideal solution theory. A new approach for predicting the conductivity of ternary electrolyte−nonelectrolyte mixture solutions in terms of the properties of their binary solutions of equal water activity is presented and compared with the measured values. The results show that the semi-ideal solution theory can provide good predictions for the densities and conductivities of the tested ternary electrolyte−nonelectrolyte solutions from the properties of their binary subsystems. [ABSTRACT FROM AUTHOR]