Abstract
The speed of sound, c, the densities, p, and heat capacity, Cp, of quasi - binary aqueous system of zinc chloride and hexamethylphosphortriamide (HMPA) were measured. From these data, various thermodynamical parameters such as molar volume, V m , adiabatic compressibility, K S,m , and their excess functions have been calculated. To express the concentration of the ternary solution as a mole fraction, the initial solution with the ratio electrolyte/water and amide/water = 1/137.5 were prepared. The x 2 =0 of mole fraction corresponds to a pure aqueous of HMPA, and x i = 1 - to aqueous of ZnCl 2 . The composition dependence of excess functions reveals a strong interaction between the components, leading to the formation of molecular complexes.
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