Abstract: Authors develop a cluster model for electrolyte solutions. In contrast to the Zavitsas model, it is assumed that the composition of clusters formed depends on the composition of the solutions. Clusters are characterized by variable hydration numbers and hydrate distribution parameters by stoichiometric numbers. The report discusses the features of the cluster model, as well as the results of its description by the equations of osmotic coefficients and activity coefficients of HClO4, HReO4 and HTcO4 solutions at 298.15 K.
Keywords: aqueous perchloric, perrhenic and pertechnetic acids, activity coefficient, osmotic coefficient, hydration numbers, cluster model