Viscosities and densities of binary electrolytic solutions at different compositions have been measured at 298.15K. Values of apparent molal volume, (ϕ_v), relative viscosity, (η_re1) and free energy of activation, (Δμ^0≠) have been deduced from density and viscosity data. Results show that there are short range and weak interactions in these binary systems.

Ultrasonic velocities and densities of sorbitol in aqueous alkali carboxylate solutions of different concentrations: 0.5 M, 1.0 M and 1.5 M at 308 K have been measured. Adiabatic compressibility,β_s; apparent molar volume, Φ_v, apparent molar compressibility,$$\Phi _{\beta _s } $$, and hydration number, H_n were deduced from their measured data. Results show that there are short range weak interactions.

Using the Brock and Bird relation and the Flory statistical theory, the surface tension of five binary mixtures of 1,1,2,2-tetrachloroethane with benzene, toluene,p-xylene, acetone and cyclohexane have been evaluated at 298.15 K. The values of surface tension thus obtained have been utilized to compute ultrasonic velocity via the Auerbach relation. Theoretical values have been compared with experimental data and deviations in the ultrasonic velocity have been interpreted in terms of intermolecular interactions.

Ultrasonic, volumetric and viscometric investigations have been conducted on adenosine base at three different temperatures 303·15, 308·15 and 313·15 K. The partial molal volume φ_v⁰, partial molal compressibility φ_k⁰, the viscosity coefficientB of the Jones-Dole equation and the solute activation parameters ΔU, ΔS and ΔH have been calculated. An attempt has been made to explain the changes in water structure when a co-solvent is added. Further, the results of viscosity experiments are tested in terms of transition state theory.