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Ultrasonic studies of aqueous solutions of nonelectrolytes

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Ultrasonic absorption has been measured in a range of non-electrolytes in aqueous solution. The experimental data are analysed in terms of the relaxation of chemical equilibria involving molecules of water, of solute and of complexes of water and solute. Four theoretical models have been used in the analysis and it is argued that, although none of these models is adequate on its own, a satisfactory theory would have to incorporate features of each one. Model I represents the simplest theoretical model for the formation of 1 : 1 complexes of water and solute; this is extended in models II and III to account for the fact that the sound absorption is a maximum at concentrations of less than 0.5 mole fraction. Model IV is an attempt to account simultaneously for the maxima of sound absorption and sound velocity with changing concentration.

Satisfactory testing of theory against experiment is hampered by the lack of physicochemical data: in particular, reliable values of the ratio of the specific heats for the solutions are required so that calculations may take into account the gradual change from isothermal propagation of sound in water to non-isothermal propagation in solutions. The values of energy, volume and entropy derived in the paper show that the theoretical models can give quantities of the expected order of magnitude.
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Document Type: Research Article

Publication date: January 1, 1965

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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