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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > December  >
In the Laboratory
An Experiment to Demonstrate How a Catalyst Affects the Rate of a Reaction
Christine L. Copper and Edward Koubek
Department of Chemistry, United States Naval Academy, Annapolis, MD 21402-5026
Cover
December 1999
Vol. 76 No. 12
p. 1714
Abstract
By performing this experiment, students in general and introductory physical chemistry can learn more about the effect of a catalyst on a chemical reaction. This experiment, which is a modified version of the traditional iodine clock reaction, allows students to calculate rates of reaction, orders of reactants, and activation energies. It also lets students discover that to increase a reaction's rate, a catalyst need only provide any additional pathway for the reaction, not necessarily a pathway having a lower activation energy. This experiment is designed so that students will notice that the amount of catalyst used is important. Furthermore, the slight amount (~10-5 M MoO42-) of catalyst needed to increase the overall reaction rate and the abrupt color change that occurs seem to pique the interest of our students.
Supplement
Instructions for procedures and calculations and additional information for the instructor are provided.
*  Contents
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*  Citation
 Copper, Christine L.; Koubek, Edward. J. Chem. Educ. 1999 76 1714.
*  Keywords
 Catalysis; Introductory / High School Chemistry; Laboratory Instruction; Physical Chemistry
*  History
 Created:
Last Updated:		 November 10, 1999
November 22, 2005
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