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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > January  >
In the Laboratory
A Spectrophotometric Study of the Permanganate–Oxalate Reaction: An Analytical Laboratory Experiment
Gene E. Kalbus, andVan T. Lieu
Department of Chemistry and Biochemistry, California State University, Long Beach, CA 90840

Lee H. Kalbus
Department of Chemistry, California State University, San Bernadino, CA 92407

Cover
January 2004
Vol. 81 No. 1
p. 100
Abstract
A spectrophotometric method has been developed to study the classic permanganate–oxalate oxidation–reduction reaction. The experiment is divided into two parts. Part I involves the determination of an unknown oxalate. This part of the experiment not only serves to quantitatively analyze oxalate by following and recording its slow bleaching effect on the absorbance of a measured excess of permanganate over a period of time, but also allows the student (i) to visually follow the course and the rate of the reaction, and (ii) to observe the auto catalytic effect of the reaction product, manganous ion. Part II of the experiment involves examination of the effect of sulfuric acid concentration and the effect of manganous ion concentration on the rate of and outcome of the permanganate–oxalate reaction. The experiment can be completed in two three-hour laboratory periods. The experiment can be modified by excluding Part II and thus be completed in one three-hour laboratory period. The experiment works well in the teaching laboratory and is well received by the students. The experiment intellectually stimulates and challenges the students. It provides the student with experience on the application of the major functions of modern recording UV–vis spectrophotometers and the basics of analytical techniques and stoichiometry calculations.
Supplement
Instructions for the students and notes for the instructor are available.
*  Contents JCE2004p0100W.doc (Microsoft Word)
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More Information
*  Citation
 Kalbus, Gene E.; Lieu, Van T.; Kalbus, Lee H. J. Chem. Educ. 2004 81 100.
*  Keywords
 Analytical Chemistry; Laboratory Instruction; Redox Reactions; Stoichiometry; UV-Vis Spectroscopy
*  History
 Created:
Last Updated:		 December 8, 2003
February 18, 2005
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