Ultrasonic Analysis of Sodium Thiosulfate in Water-Tetrahydrofuran Mixture Across Varying Temperatures

The research investigates the ultrasonic properties of sodium thiosulfate in a mixed solvent of water and tetrahydrofuran (10% w/w) across various temperatures (293 K, 298 K, 303 K, 308 K, and 313 K). Ultrasonic velocity measurements were performed to examine molecular interactions and the structural dynamics of the solution. Acoustic parameters, including adiabatic compressibility, acoustic impedance, and intermolecular free length, were extracted from the experimental data to elucidate the physicochemical properties of the system. Temperature fluctuations markedly affected ultrasonic velocity and resultant acoustic properties, indicating alterations in solute-solvent and solvent-solvent interactions. At reduced temperatures, the system exhibited an increased level of intermolecular association, due to hydrogen bonding and solvent structuring. With the rise in temperature, a gradual disruption in these interactions was noted, resulting in alterations in acoustic impedance and compressibility. The research emphasizes the function of tetrahydrofuran as a co-solvent in altering the characteristics of the water-solvent system. The findings indicate that the incorporation of tetrahydrofuran diminishes the rigidity of the solvent structure, thereby improving molecular dynamics. This analysis is essential for comprehending the solvation behavior of ionic compounds in mixed solvents, especially for use in industrial and pharmaceutical formulations. The results emphasize the significance of ultrasonic methods in elucidating molecular interactions and their temperature dependence, facilitating further investigation of intricate solvent systems and their prospective applications.