J. Phys. IV France 129 (2005) 21-23
Ultrasonic, densitometric and pH study of quasi-binary aqueous system of zinc chloride and hexamethyl-phosphoramideZ. Golebiewski1, P. Miecznik1 and S. Mielcarek2
1 A. Mickiewicz University, Faculty of Physics, Institute of Acoustics, Umultowska 85, 61-614 Poznan, Poland
2 A. Mickiewicz University, Faculty of Physics, Department of Crystal Physics, Umultowska 85, 61-614 Poznan, Poland
The speed of sound, c, the densities, , and heat capacity, , of quasi - binary aqueous system of zinc chloride and hexamethylphosphortriamide (HMPA) were measured. From these data, various thermodynamical parameters such as molar volume, , adiabatic compressibility, , 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 x2 0 of mole fraction corresponds to a pure aqueous of HMPA, and x2 = 1 - to aqueous of ZnCl2. The composition dependence of excess functions reveals a strong interaction between the components, leading to the formation of molecular complexes.
© EDP Sciences 2005