ADIABATIC COMPRESSIBILITY AND STRUCTURAL FEATURES OF NON-ELECTROLYTE AQUEOUS SOLUTIONS

Structural characteristics of the hydration complexes of non-electrolytes such as the hydration numbers h, molar adiabatic compressibility of hydration complexes beta V-h(h), the molar volume of water in the hydration sphere V-1h, the solute molar volume without hydration environments V-2h and others are determined using the data on the ultrasonic velocity, the density and heat capacity of aqueous solutions of urea, urotropine, acetonitrile, and a number of amides of N-acetyl amino acids. A theoretical model of solvation is also applied. A comparison of the environments of hydrated urotropine molecules with those of urea and acetonitrile molecules in an aqueous medium shows a considerable hydrophobic interaction of urotropine with a solvent.