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1998
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April
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In the Laboratory
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Kinetics-Based Indirect Spectrophotometric Method for Simultaneous Determination of MnO4- and Cr2O72-: A Modern Instrumental Analysis Laboratory Experiment
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Siddharth Pandey, Mary E. R. McHale, Ann-Sofi M. Horton, Sandra A. Padilla, Ashantè L. Trufant, Noé U. De La Sancha, Ernesto Vela, and William E. Acree, Jr.
University of North Texas, Department of Chemistry, P.O. Box 5068, Denton, TX 76203-5070
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April 1998
Vol. 75 No. 4
p. 450
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| Abstract |
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An indirect kinetics-based spectrophotometric method is developed for the simultaneous quantitative determination of permanganate and dichromate ion concentrations in an unknown. The method is based upon differences in reaction times between pyrogallol red and the two analytes. Oxidation of pyrogallol red (PGR) by permanganate ion is rapid, whereas oxidation of PGR by the dichromate ion is much slower. From changes in the measured absorbances after 3-and 8-minute reaction times, the molar concentrations of the permanganate and dichromate ions are determined.
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| More Information |
 Citation |
Siddharth Pandey, Mary E. R. McHale, Ann-Sofi M. Horton, Sandra A. Padilla, Ashantè L. Trufant, Noé U. De La Sancha, Ernesto Vela, and William E. Acree, Jr. J. Chem. Educ. 1998 75 450.
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Keywords |
Analytical Chemistry, Laboratory Instruction, Instrumental Methods, Spectroscopy
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History |
Created:
Last Updated: |
June 25, 1999
June 24, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
1998
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April
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450
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