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Issue 13, 1996
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Ultrasonic speeds and volumetric properties of binary mixtures of water with 2-[2-(2-alkoxyethoxy)ethoxy]ethanols at 298.15 K

Abstract

Density and ultrasonic speed measurements have been made using vibrating tube densimeters and by a sonic solution monitor using a ‘pulse-echo-overlap’ technique, respectively, for aqueous mixtures of 2-[2-(2-ethoxyethoxy)ethoxy]ethanol and 2-[2-(2-butoxyethoxy)ethoxy]ethanol, at 298.15 K, across the entire composition range. The density values were readily converted to molar volumes, V, and excess molar volumes, VE. Estimates of the isentropic molar quantity, Ks, equal to –(∂V/∂p)s, and of its excess counterpart, KEs, were obtained from the density values, in combination with the ultrasonic speed values. The magnitude of VE decreases with the alkyl-chain length, except in the water-rich region. The composition dependence of KEs shows a similar decrease. Data reduction procedures were used to calculate several related quantities leading to graphs with enhanced visual impact. Results were compared with those reported earlier for 2-[2-(2-methoxyethoxy)ethoxy]ethanol–water and 2-[2-(2-hexyloxyethoxy)ethoxy]ethanol–water, and for 2-butoxyethanol–water and 2-(2-butoxyethoxy)ethanol–water. Graphs of the data sets are presented as a basis for discussion of evidence for prevailing patterns of molecular aggregation. Segmented-composition models, including a version onto which a mass-action component has been grafted, were used to analyse the various excess molar quantities.

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Article information


J. Chem. Soc., Faraday Trans., 1996,92, 2369-2379
Article type
Paper

Ultrasonic speeds and volumetric properties of binary mixtures of water with 2-[2-(2-alkoxyethoxy)ethoxy]ethanols at 298.15 K

G. Douhéret, M. I. Davis, J. Ulloa, H. Høiland and I. J. Fjellanger, J. Chem. Soc., Faraday Trans., 1996, 92, 2369
DOI: 10.1039/FT9969202369

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