Refractometry of water-ethanol solutions near their contraction point

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Abstract

The concentration dependences of the refractive index in aqueous ethanol solutions at equilibrium have been studied experimentally. Special attention was paid to their behavior in a vicinity of the peculiar point defined as the intersection point of the concentration dependences of the contraction measured at different temperatures or as a point, at which the intensity of molecular light scattering has a maximum. The refractive index is found to noticeably deviate from its reference values in a vicinity of the peculiar point, 0.05 < x < 0.1 (x is the mole fraction of ethanol). This effect reflects the fact that the equilibrium properties of the solutions concerned are established only during a few weeks. Arguments that the system becomes microinhomogeneous in this concentration interval are presented.

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Bulavin, L. A., Gotsulskiy, V. Y., Malomuzh, N. P., & Stiranets, M. V. (2015). Refractometry of water-ethanol solutions near their contraction point. Ukrainian Journal of Physics, 60(11), 1108–1114. https://doi.org/10.15407/ujpe60.11.1108

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