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VAPOR-PRESSURES OF DILUTE AQUEOUS T-BUTYL ALCOHOL - HOW DILUTE IS THE HENRYS LAW REGION

TitleVAPOR-PRESSURES OF DILUTE AQUEOUS T-BUTYL ALCOHOL - HOW DILUTE IS THE HENRYS LAW REGION
Publication TypeJournal Article
Year of Publication1995
AuthorsKoga, Y
JournalJournal of Physical Chemistry
Volume99
Pagination6231-6233
Date PublishedApr
Type of ArticleArticle
ISBN Number0022-3654
Keywords25-DEGREES-C, MIXING SCHEME, PARTIAL MOLAR ENTHALPIES, TERT-BUTANOL MIXTURES, WATER
Abstract

Vapor pressures of aqueous t-butyl alcohol (TBA) were determined at 25 degrees C by the static method in the mole fraction range, 0.000 068 < x(TBA) < 0.006. The partial pressures of TBA, p(TBA), and those of H2O, p(W), were calculated by a numerical integration method developed by Boissonnas. It was pointed out that this method inevitably introduces errors in the first few data points from the dilute end, which will be self-corrected after several data points. Together with the data obtained for the range x(TBA) > 0.002 in the previous work (J. Phys. Chem. 1990, 94, 7700), reliable values of the excess partial molar Gibbs function of TBA, G(m)(E)(TBA), were obtained. It was concluded that at the most dilute point measured, x(TBA) 0.000 068 (m(TBA) = 0.0038 mol/kg), the solution is not yet dilute enough for Henry’s law to be obeyed.

URL<Go to ISI>://A1995QU82800069