Acoustic and Thermodynamic Studies of Ternary Liquid Mixtures at Different Temperatures

The ultrasonic study of velocity, density anal viscosity has been carried out for the mixtures of alcohols, namely - isopropyl alcohol, propylene glycol and glycerol with N-N dimethyl acetamide (DMA) in cyclohexane at 303,308 and 313 K. The experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (beta), intermolecular free length (L-f), free volume (V-f), internal pressure (pi(f)), molar volume (V-m) and acoustic impedance (Z). Some of the excess parameters have also been evaluated and fitted to Redlich Kister polynomials to test the validity of the excess values. It is observed in the present liquid mixtures that as number of O-H groups increases from isopropyl alcohol to glycerol, the strength of the molecular interactions between unlike molecules weakens.