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Ultrasonic studies is very useful in describing the theory of liquid state of matter. When two or more liquids are mixed, there occur some changes in physical and thermodynamic properties because of free volume change, change in energy and change in molecular orientations. The density (ρ), ultrasonic velocity (U) and viscosity (η) can be used to study the physico-chemical behavior and molecular interactions in pure liquids, liquid mixtures and the solutions. Thermodynamic and acoustical parameters like Acoustic impedance (Z), Adiabatic Compressibility (β), Intermolecular free length (Lf), Relaxation time (τ) and Gibb’s free energy(ΔG) are of considerable interest in understanding the inter-molecular interactions in polymer solution. From the acoustical parameters, the nature and the strength of molecular interactions in the binary system of polymer dextran with sodium hydroxide are discussed. The changes in the nature and degree of molecular interactions in different concentration of polymer dextran with sodium hydroxide, depends upon the nature of solvent, the structure of solute molecule and extent of solution taking place in the solution. The density, ultrasonic velocity and viscosity at 313 K temperature in different frequency ranging from 1, 5, 9 and 12MHz have been measured of the polymer dextran with sodium hydroxide solutions.
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