Applications of the Gibbs-Duhem Equation

P. Nikitas
Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
J. Chem. Educ., 2001, 78 (8), p 1070
DOI: 10.1021/ed078p1070
Publication Date (Web): August 1, 2001
History, Education, and Documentation

Abstract

It is shown that the Gibbs-Duhem equation can be used for the calculation of (i) a partial molar quantity of a binary mixture from measurements of the composition dependence of the corresponding total molar quantity, (ii) the partial molar quantity of a component, say 1, of a binary mixture from measurements of the composition dependence of the corresponding partial molar quantity of component 2, and (iii) the partial vapor pressures from measurements of the liquid-phase composition dependence of the total vapor pressure. All these calculations require a curve-fitting procedure. Using tabulated experimental data the accuracy of the calculated quantities was found to be comparable to the accuracy of the original experimental data.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Subject):

Molecular Properties / Structure
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  • Received: August 03, 2009

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