Thermo-Acoustic Parameters of Multi-Charged Electrolytes (Sodium Thiosulphate and Sodium Chromate) in Aqueous Binary Fructose Solutions and Derivation of Surface Excess Values from Ultrasonic Velocity Measurements

摘要

The ultrasonic velocity (U) in the solutions of sodium thiosulphate and sodium chromate has been measured in the concentration range of 1×10-2 to 1×10-1 mol dm-3 in aqueous binary mixtures containing fructose (5, 10, 15% (w/w) at 298.15 K only. Various important parameters such as isentropic compressibility (Ks), solvation number (Sn) and other acoustic parameters have been computed using experimentally determined sound velocities. In the light of solute-solvent and solute-solute interactions, the variation of these parameters has been enlightened. The surface tension values have been computed from ultrasonic velocity and density values. The data were analyzed using the Gibbs equation to evaluate surface excess. The results reveal the nature of solute adsorption at the interface in these solutions.