ADIABATIC COMPRESSIBILITY AND STRUCTURAL FEATURES OF NON-ELECTROLYTE AQUEOUS SOLUTIONS
Structural characteristics of the hydration complexes of non-electrolytes such as the hydration numbers <i>h</i>, molar adiabatic compressibility of hydration complexes β<sub><i>h</i></sub><i>V</i><sub><i>h</i></sub>, the molar volume of water in the hydration sphere<i> V</i><sub>1<i>h</i></sub>, the solute molar volume without hydration environments<i> V</i><sub>2<i>h</i></sub> 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.