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Thermodynamic studies of aqueous solutions of non-electrolytes.

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posted on 2015-11-19, 08:47 authored by R. W. Smith
The excess enthalpies and excess volumes of mixing of water with a number of cyclic ethers have been measured. The results are discussed in the light of present day understanding of the structure of aqueous solutions of non-electrolytes . By correlation with data obtained using other techniques it appears that inter component hydrogen bonding plays a large role in these systems over the major part of the composition range. In the highly aqueous regions, however, this is not the case and it is likely that hydro- phobic stabilisation of water structure is a dominant factor. The mutual solubility curve for water + propylene oxide has been determined, showing the occurrence of an upper critical solution temperature, A lower critical solution temperature has been shown to exist for water + tetrahydro- furan. 'Freezing point measurements on water + 1,3-dioxolane and water + 1,3-dioxan mixtures have confirmed the existence of a structure II hydrate of the former and discovered a previously unreported hydrate of" the latter (probably structure II). Highly accurate excess enthalpies of mixing for water + acetonitrile, measured in the present work, have been used by other workers, to successfully predict the ultrasonic absorption behaviour of these solutions. An outline of the treatment is given.

History

Date of award

1970-01-01

Author affiliation

Chemistry

Awarding institution

University of Leicester

Qualification level

  • Doctoral

Qualification name

  • PhD

Language

en

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