Interionic interactions of Nickle Sulphate in Aqueous and Aqueous Methanol Mixtures

Densities of divalent transition metal sulphate, viz. nickel sulphate (NiSO4), were measured in aqueous and aqueous methanol mixtures (10% to 40% v/v) within concentration range (1x10 to 10x10 mol.dm) at different temperatures (298 to 323 K). The acquired data have been analyzed by using the Masson equation for ascertaining apparent molar volume (φv), partial molar volumes (∅v ° ) and experimental slopes (Sv). The obtained results are interpreted in terms of the ion-ion interaction and ion-solvent interactions. Structure making/breaking capacities of electrolytes have been incidental from the Hepler’s criterion i.e. ∂∅v ° ∂T2 P second derivative of partial molar volume with respect to temperature at constant pressure. Results showed that NiSO4 in aqueous and aqueous methanol mixtures ranging from 10% to 40% v/v act as structure breaker.