Ultrasonic and thermodynamic studies of interactions in ternary solutions containing glycerol or sorbitol and aqueous electrolytes

Abstract

Ultrasonic velocities and densities of glycerol and sorbitol in aqueous alkali halide solutions of different concentrations at 308 K have been measured. The values of adiabatic compressibility <i>(K</i>_s<i>.), </i> apparent molar volume (φ_n), apparent molar compressibility (φ<i>K</i>_s) and hydration number <i>(H</i>_n<i>) </i> have been deduced from density and ultrasonic velocity data. Results show that: (i) there are short range and weak interactions in the present ternary systems, (ii) ions such as Na⁺, K⁺, Cl^-, Br^- are structure makers (SM) in both glycerol and sorbitol in the order Na⁺ >.K⁺ > CI^- > Br^- > I^-, while I^- is structure breaker (SB).