A study on ion-solvent interactions of some sulfate compounds in aqueous tetrahydrofuran at different temperatures

Department of Chemistry, University of North Bengal, Darjeeling-734 430, India

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Manuscript received 11 July 2001, revised I January 2002, accepted 12 February 2002

The densities and viscosities of ammonium sulfate, sodium sulfate, magnesium sulfate and aluminium sulfate in 40 mass% tetrahydrofuran + water mixture have been measured at temperatures 303, 308, 313 and 318 K. Apparent molar volumes (V_Φ) and viscosity B-coefficients of these electrolytes are derived from these data supplemented with their densities and viscosities, respectively. The limiting apparent molar volumes (V_Φ°) and experimental slopes (S_v^*) obtained from Masson equation have been interpreted in terms of ion-solvent and ion-ion interactions, respectively. The viscosity data have been analyzed using Jones-Dole equation. The V_Φ values vary with temperature as a power of series of temperature. The struc­ture-making/breaking capacities of the electrolytes studied here have been inferred from the Hepler's criterion.