Hydration numbers of non-electrolytes - Application of the acoustic method of Pasynski

Applicability of the acoustic Pasynski method of determination of hydration numbers for non-electrolytic aqueous solutions has been tested and discussed. It was shown for dilute aqueous solutions of few homologous series of organic non-electrolytes that the hydration numbers are strongly and directly depending on the length of solute molecules and the groups which are their constituents. Thus, the results suggest that hydration is an additive parameter, although its mechanisms are different.