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ERIC Number: EJ998972
Record Type: Journal
Publication Date: 2012-Jun
Pages: 4
Abstractor: As Provided
Reference Count: 14
ISBN: N/A
ISSN: ISSN-0021-9584
Employing Magnetic Levitation to Monitor Reaction Kinetics and Measure Activation Energy
Benz, Lauren; Cesafsky, Karen E.; Le, Tran; Park, Aileen; Malicky, David
Journal of Chemical Education, v89 n6 p776-779 Jun 2012
This article describes a simple and inexpensive undergraduate-level kinetics experiment that uses magnetic levitation to monitor the progress and determine the activation energy of a condensation reaction on a polymeric solid support. The method employs a cuvette filled with a paramagnetic solution positioned between two strong magnets. The vertical position of the polymeric beads suspended in the paramagnetic solution correlates with the density of the beads and, consequently, with the progress of the chemical reaction within these beads. Varying the temperature of the reaction between the leucine-functionalized support and 2,5-diiodobenzoic acid under pseudo-first-order reaction conditions yields an activation energy of 65.4 [plus or minus] 9.2 kJ/mol. This value compares well the activation energy of 63.5 [plus or minus] 4.1 kJ/mol determined using a density analysis. This experiment combines a number of interdisciplinary concepts including organic chemistry, kinetics, and magnetism and, therefore, could be implemented in a number of undergraduate chemistry courses at various levels. (Contains 1 table, 4 figures and 1 scheme.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A