Studies on the densities, viscosities and adiabatic compressibilities of some mineral salts in aqueous binary mixture of tetrahydrofuran at different temperatures

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

E-mail : Mahendraroy2002@yahoo.co. in    Fax : 91-353-2581546

Manuscript received 27 June 2002, revised 12 November 2002. accepted 13 January 2003

The densities, viscosities and ultrasonic velocities of some mineral salts, viz. ammonium nitrate (NH₄NO₃), potassium nitrate (KNO₃), magnesium nitrate (Mg(NO₃)₂) and calcium nitrate (Ca(NO₃)₂) in 30 mass % tetrahydrofuran +water mixture have been measured at temparatures 303, 308, 313, 318 and 323 K. Apparent molar volumes (V_Φ), viscosity β-coefficients and adiabatic compressibility (β) of these electrolytes were derived from these data supplemented with their densities, viscosities and ultrasonic velocities, respectively. The limiting apparent molar volumes (V⁰_Φ) and experiment:ll 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 results show that these electrolytes have structure-making capacities in this solvent-mixture. The compressibility data also indicate the electrostriction of solvent molecules around the metal ions.