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The ternary systems containing Water, Ascorbic acid (AA) and ZnSO 4 ·7H 2 O were investigated using three approaches namely volumetric studies, viscosity studies and conductance studies. The solvent systems used were 2, 4 and 6% (by weight) of AA in water. The studies were conducted at four temperatures (303.15–318.15 K with an interval of 5 K) and pressure 0.1 MPa with concentration of ZnSO 4 ·7H 2 O in the solution ranging from 0.01 to 0.12 m. Various parameters like partial molar volume ( ϕ  v ), apparent molar volume(ϕ   v   o)$({\phi }_{\text{v}}^{\text{o}})$, Hepler’s constant((d   2ϕ   v   o/   dT   2)p)$({({d}^{2}{\phi }_{\text{v}}^{\text{o}}/d{T}^{2})}_{p})$, partial molar expansibility(ϕ   E   o)$({\phi }_{\text{E}}^{\text{o}})$and transfer volume(Δt   rϕ   v   o)$({{\Delta}}_{tr}{\phi }_{\text{v}}^{\text{o}})$have been evaluated from volumetric studies. The viscosity studies have yielded Jones-Dole parameters (A and B) and free energy of activation per mole for solvent(Δμ   10   ‡)$({\Delta}{\mu }_{1}^{0{\ddagger}})$and solute(Δμ   20   ‡)$({\Delta}{\mu }_{2}^{0{\ddagger}})$. The conductance data has been used to calculate molar conductance (Λ m ), limiting molar conductance(Λ   m   o)$({{\Lambda}}_{\text{m}}^{\text{o}})$and Walden product(Λ   m   oη   o)$({{\Lambda}}_{\text{m}}^{\text{o}}{\eta }_{\text{o}})$. The results of these studies agree with each other and have concluded the structure breaker behavior of ZnSO 4 ·7H 2 O in the solvent system containing AA and water.

Molecular interaction studies on the binding ability of hydrated zinc sulphate with aqueous solution of ascorbic acid at different temperatures