Ultrasonic Relaxation in Ethanol-Ethyl Halide Mixtures

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Abstract
Ultrasonic studies in mixtures of ethanol and various ethyl halides show that maxima exist in the plots of the absorption coefficient versus concentration. These maxima are located at relatively small ethanol concentrations. The measurements made include a detailed investigation of the temperature and frequency dependence of the absorption in the ethanol-ethyl chloride system and somewhat less complete studies of the ethanol-ethyl bromide and ethanol-ethyl iodide systems. In each of the systems the measurements were made as a function of concentration. The results in the ethanol-ethyl chloride mixtures indicate the presence of a single relaxation process occurring in the range of measurement (15-165 MHz). The mechanism for this relaxation process is considered both in terms of a quasichemical association theory and in terms of a fluctuating concentration theory. The suggestion is made that the relaxational behavior may be connected with the existence azeotropic concentrations in these mixtures.