Determination of the Azeotropic Composition for Cyclohexane and

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Determination of the Azeotropic Composition for Cyclohexane and Ethanol Using Gas Chromatographic Data by Beatriz H. Cardelino, Chemistry Department, Spelman College, Atlanta, GA 30314; [email protected] Keywords: Upper-Division Undergraduate, Physical Chemistry, Curriculum, Computer-Based Learning, Computational Chemistry, Physical Properties

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edited by

W. Tandy Grubbs Stetson University DeLand, FL 32720

The azeotropic composition for cyclohexane and ethanol binary solutions is determined from calculations of Gibbs free energy of mixing. Gas chromatography data are used to calculate the activity coefficients. Based on the uncertainty of all the measurements and using error-propagation techniques, the property is calculated with its associated uncertainty. This exercise is appropriate for the undergraduate physical chemistry curriculum.

Journal of Chemical Education  •  Vol. 86  No. 6  June 2009  •  www.JCE.DivCHED.org  •  © Division of Chemical Education