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Molecular Interionic Interaction Studies of Some Divalent Transition Metal Sulphates in Aqueous Ethylene Glycol at Different Temperatures

The present study aims for the structure-making and structure –breaking behavior of some divalent metal Sulphates in aqueous ethylene glycol at 308.15, 313.15 and 318.15K. The present investigation exploring the possible molecular interactions between the metal sulphate and ethylene glycol which is known to have much dissociation of metal sulphates in the solvent mixture. Experimental values of density, viscosity and ultrasonic velocities were carried out on the liquid ternary mixtures of water +ethylene glycol + metal sulphates namely manganese sulphate, nickel sulphate and cobalt sulphate at 308.15,313.15 and 318.15K. The binary solvent mixture of water + ethylene glycol was prepared in the constant ratio of 4:1. Metal sulphates solution was added under molality basis with these binary solvent mixtures. The related and relevant parameters correlated to our present study such as adiabatic compressibility ( β), molal hydration number (n H), apparent molal compressibility ( ϕK), apparent molal volume ( ϕV), limiting apparent molal compressibility ( 0 � ), limiting apparent molal volume ( 0 V � ) and their associated constants (S K, S V), transfer volume ( � 0 V � ) from water to aqueous solution and the viscosity B-Coefficient of JonesDole equations were meticulously evaluated. The molecular associations such as ion-ion, ion-solvent, solute-solvent, solutesolute etc are identified and critically discussed in terms of the structure-making and structure-breaking behaviour of metal sulphates in the solvent mixture.