Concentration and temperature dependence of ultrasonic velocity and isentropic compressibility in aqueous sodium nitrate and sodium thiosulfate solutions

Abstract

Ultrasonic velocities (u/m s^-1) of aqueous sodium nitrate and sodium thiosulfate solutions have been measured as functions of temperature (278.15⩽T/K⩽323.15) and concentration (0.006⩽m/mol kg^-1⩽10.522). Isentropic compressibilities (κ_S), apparent molal isentropic compressibilities (K_S,φ) and hydration numbers (n_h) for both systems have been calculated. Sodium thiosulfate is more highly hydrated than sodium nitrate; the primary hydration numbers of NO₃^- and S₂O₃^2- ions have been estimated to be 6 and 13, respectively. The values of κ_S, K_S,φ and n_h indicate that a strong structural effect exists in the sodium thiosulfate system arising from strong ion–solvent and ion–ion interactions in different concentration regions.

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