Application of Ultrasonic Behaviour to Study Free Volume and Internal Pressure in Aqueous Solution of Lithium Formate and Lead Acetate

In the present work free volume V_f and internal pressure π_i have been detemined in aqueous solutions of Lithium Formate and Lead Acetate for six different concentrations within the temperature range of 30°C to 55°C. The ultrasonic velocity measurements have been determined using fixed frequency 2 MHz variable path electro acoustic interferometer and Ostwald Viscometer is used for viscosity measurements. The concentration dependence of viscosity was explained by Jones-Dole equation. The coefficients A and B the above equation have been studied at different temperatures in both the systems. Further, the difference in internal pressure π_i has been evaluated in each system which gives an idea about the effect of cohesive forces in ion-solvent interaction. It is understood that sensitive information regarding the cohesive forces is well obtained by the data of Δπ_i instead of the coefficients A and B of the Jones-Dole equation.