Limiting Partial Molar Volumes of Ions in Water–Methanol and Water–Acetonitrile

Abstract

Abstract Measurements of densities of solution of AgNO3 and Ca(NO3)2 in the mixed solvents water–methanol and water–acetonitrile were carried out at 25°C and the partial molar volumes V2∞ of these electrolytes were determined by taking account of the concentration dependence of the apparent molar volumes predicted by the Debye–Huckel theory. The ionic partial molar volumes of Ag+, Ca2+, and NO3− were evaluated and compared with those of other ions in the two mixed solvent systems. The solvent composition dependence is more remarkable in water–acetonitrile than in water–methanol, and characteristic behavior was observed for Ag+ and Ca2+ ions in water–acetonitrile system.