Abstract
As the molecular compressibility W (= M /ρβ 1/7 , where M =mean molecular weight, ρ=density, and β=adiabatic compressibility) in usual liquid mixtures is a linear function of the molar fractions of the constituent liquids within experimental errors, but slightly deviates from linearity in aqueous solutions (cf. Nomoto, J. Phys. Soc. Japan 8 (1953) 553), this deviation was attributed to the structure change of water molecules in aqueous solutions by the influence of the solute molecules. Computation of the molar fractions ( n a , n s ) of the associated and the single molecules of water in dependence on the concentration has been performed in aqueous solutions of methanol, ethanol, n-propanol, iso-propanol and acetone using existing ultrasonic data. It was revealed that the change of n a and n s by concentration is characteristic of each solution and widely different from one another.
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