The measurement of heat capacity differences due to the change of water structure in aqueous solutions of organic compounds

In order to observe more directly the structural organization of water mole cules around a nonpolar molecule in an aqueous solution, heat capacity diff erences between two kinds of solutions (solution I and II) of quaternary am monium salts were measured. In the solution I stable water structure was re tained as much as possible and in the solution II water structure was destr oyed either by heating to high temperatures or by irradiating with ultrason ic waves. It was found that the heat capacity differences ((C-p)(II)-(C-p)( I)) were slightly positive and its maximum values corresponded to 7-8 perce nt of the heat capacity of pure water itself.