Complexity investigation in solutions of ZnCl2 and LiCI in water using an acoustic method

The formation of complex ions brings about in water solutions a destruction of the water structure, thus leading to the formation of a new structure in the solution which is considerably less cohesive than the original water structure.
The investigations performed with zinc chloride and lithium chloride solutions in water indicate that those solutions in which the ratio of zinc atoms to chlorine atoms is near to 1:4, i.e. near to the ratio for the formation of ZnCI^{–2}_{4}, have maximum adiabatic compressibility, minimum hydration number and minimum viscosity. Measurements of the absorption coefficient of ultrasonic waves have shown that the process of relaxation of the formation and disintegration of complex ions with a relaxation time of 10^{-8} s exerts a predominating influence on the sound absorption.