Ultrasonic, densitometric and pH study of quasi-binary aqueous system of zinc chloride and hexamethyl-phosphoramide

Z. Golebiewski; P. Miecznik; S. Mielcarek

doi:doi:10.1051/jp4:2005129005

Issue		J. Phys. IV France Volume 129, October 2005


Page(s)		21 - 23
DOI		https://doi.org/10.1051/jp4:2005129005

J. Phys. IV France 129 (2005) 21-23
DOI: 10.1051/jp4:2005129005

Ultrasonic, densitometric and pH study of quasi-binary aqueous system of zinc chloride and hexamethyl-phosphoramide

Z. 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

Abstract
The speed of sound, c, the densities, $\rho$ , and heat capacity, $C_{\rm p}$ , of quasi - binary aqueous system of zinc chloride and hexamethylphosphortriamide (HMPA) were measured. From these data, various thermodynamical parameters such as molar volume, $V_{\rm m}$ , adiabatic compressibility, $K_{\rm S,m}$ , 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 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.