State of Association of Water Molecules in Aqueous Solutions as deduced from Sound Velocity Data
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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.
- 社団法人日本物理学会の論文
- 1956-11-05
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