ERIC Number: EJ985203
Record Type: Journal
Publication Date: 2012-Mar
Pages: 5
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: N/A
The Effect of Temperature and Ionic Strength on the Oxidation of Iodide by Iron(III): A Clock Reaction Kinetic Study
Bauer, Jurica; Tomisic, Vladislav; Vrkljan, Petar B. A.
Journal of Chemical Education, v89 n4 p540-544 Mar 2012
A laboratory exercise has recently been reported in which the students use the initial rates method based on the clock reaction approach to deduce the rate law and propose a reaction mechanism for the oxidation of iodide by iron(III) ions. The same approach is used in the exercise proposed herein; the students determine the dependence of the reaction rate on ionic strength and temperature in a straightforward manner. The previously proposed mechanism is further supported by the results, the rate-determining step is identified, and the activation parameters E[subscript a], [delta][is not equal to]H, and [delta][is not equal to]S are determined for the overall reaction of the first two steps of the mechanism. The significance of such kinetic studies in elaborating reaction mechanisms is clearly demonstrated to the students. (Contains 3 figures.)
Descriptors: Science Instruction, Chemistry, Kinetics, Secondary School Science, High Schools, College Science, Undergraduate Study, Science Laboratories, Thermodynamics, Hands on Science, Scientific Concepts, Equations (Mathematics)
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 - Evaluative
Education Level: High Schools; Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A