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  Home > JCE Print > Journal of Chemical Education > Issues > 2008  > August  >
In the Laboratory
Kinetics and Mechanism of Iodide Oxidation by Iron(III): A Clock Reaction Approach
Jurica Bauer, Vladislav Tomišić
Department of Chemistry, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia

Petar B. A. Vrkljan
XVIII Gymnasium, Zagreb, Croatia

Cover
August 2008
Vol. 85 No. 8
p. 1123

Abstract
A simple method for studying the kinetics of a chemical reaction is described and the significance of reaction orders in deducing reaction mechanisms is demonstrated. In this student laboratory experiment, oxidation of iodide by iron(III) ions in an acidic medium is transformed into a clock reaction. By means of the initial rates method, it is found that the reaction is second order with respect to iodide and first order with respect to iron(III) ions. Having established the rate law, the students are encouraged to propose a possible mechanism for the reaction investigated.
Supplement
Student handouts; Instructor notes.
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Contents
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Citation
Bauer, Jurica; Tomišić, Vladislav; Vrkljan, Petar B. A. J. Chem. Educ. 2008, 85, 1123.
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Keywords
Hands-On Learning / Manipulatives; Kinetics; Laboratory Instruction; Mechanisms of Reactions; Physical Chemistry; Rate Law; Reactive Intermediates; Upper-Division Undergraduate
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History
Created:
Last Updated:
6/23/2008
7/2/2008
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Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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