Рефрактометрiя водних розчинiв етанолу поблизу особливої точки контракцiї

• Main Authors: Bulavin, L. A., Gotsulskiy, V. Ya., Malomuzh, N. P., Stiranets, M. V.
• Format: Article
• Language: English; Ukrainian
• Published: Publishing house "Academperiodika" 2019
• Subjects: воднi розчини етанолу; коефiцiєнт заломлення; мiкронеоднорiдна структура; water-alcohol solutions; refractive index; microinhomogeneous structure; -
• Online Access: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019147

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.