Molar volume, viscosity and conductance studies of nickel sulphate in water and aqueous mannitol

Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla-171 005, Himachal Pradesh, India Manuscript received 17 March 2008, accepted 7 August 2008 Molar volume, viscosity and conductance of nickel sulphate in water and 2, 4 and 6 wt. % of aqueous mannitol solutions have been evaluated from density, viscosity and conductance data respectively at temperatures 303.15, 308.15, 313.15 and 318.15 K. The solute-solvent interactions for nickel sulphate in water and various compositions of aqueous mannitol have been inferred from \(\phi \)0v, B-coefficient of Jones-Dole equation and Ʌ\(_m^O\) values. The structure making/ breaking behaviour of nickel sulphate is inferred from the sign of [∂2 \(\phi \)\(_V^O\)/∂T2]p, dB/dT and temperature coefficient of Walden product i.e. d(Ʌ\(_m^O\))/ղ0)dT values. It has been found that nickel sulphate behaves as structure-breaker in water and structure-maker in 2, 4 and 6 wt. % of aqueous mannitol solutions from molar volume, viscosity and conductance studies. The energy of activation for nickel sulphate in different composition of aqueous mannitol have also been calculated from conductance and viscosity data