Molecular interactions and excess thermodynamic properties of mixed solutions of zinc sulphate and zinc nitrate at 303K by ultrasonic method.

ABSTRACT

The ultrasonic velocity, density and viscosity were measured in aqueous mixtures of zinc sulphate (Heptahydrate) and zinc nitrate (Hexahydrate) at 308 K. Acoustic parameters, such as specific acoustic impedance, free length, isotropic compressibility, molar compressibility, molar sound velocity, free volume, available volume, relaxation time, excess parameters and the deviation from the experimental values has been evaluated. The value of ultrasonic velocity decreases and comes to a minimum and then increases as the mole fraction of zinc nitrate increases in the mixed salt solution. The excess adiabatic compressibility of zinc sulphate and zinc nitrate mixed solution with water was positive at all concentrations, while it is negative at a mole fraction of 0.7945. Variation of these parameters with concentration indicates the non-linear behavior. This non-linear variation of velocity with increase in concentration indicates the complex formation between the constituents of mixture. The results were interpreted as per the intermolecular interactions.