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The studies of thermodynamic and transport properties of liquid mixtures consisting of polar as well as non-polar components are essential for industrial applications. A large number of investigations have been made on the molecular interaction in liquid mixture by various methods. Ultrasonic velocity and related data in liquid mixtures are found to be the most powerful tool in explaining the theories of liquid state. The application of ultrasonic waves does not produce changes in the structure of the liquids and the destruction of the samples. These waves just perturb the physico-chemical equilibria of the medium. The velocity of ultrasonic wave in a medium is inversely proportional to the density and modulus of elasticity. Velocity of sound is highly sensitive to the structure and molecular interactions in the liquid system as it is fundamentally related to the binding forces between components of the system. More clustering of molecules results the decrease in distance between surfaces of individual molecules leading to quick transfer of sound energy and increase in velocity. Molecular interactions affect the physical and chemical properties like boiling point, freezing point, heat of mixing, dipole moment etc in the liquid and liquid mixtures. Ultrasonic velocity,density and coefficient of viscosity in binary mixture of dimethyl acetamide(DMAC) with polar liquids acetone and isobutyl methyl ketone and non-polar liquid diethyl ether at different frequencies have been measured at constant temperature 308K. The observed data have been used to compute excess adiabatic compressibility, excess free volume, excess internal pressure and excess enthalpy for entire range of mole fraction and are interpreted to explain molecular interaction occurring in the liquid mixtures. Among the three diluents of DMAC, acetone and isobutyl methyl ketone are dipolar aprotic and diethyl ether is non-polar. In DMAC and acetone system association takes place and the mixture may be used as a good solvent in solvent extraction process. In DMAC and isobutyl methyl ketone system dissociation takes place and the mixture may not be used as a better solvent in solvent extraction process. In DMAC and diethyl ether system solvation takes place and the mixture may be used as a better solvent in solvent extraction process. Among the three systems the extraction efficiency of DMAC and diethyl ether system is more due to more pronounced molecular interactions.
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