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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > October  >
In the Laboratory
pH Dependent Redox Couple: An Illustration of the Nernst Equation
Mary M. Walczak, Deborah A. Dryer, Dana D. Jacobson, Michele G. Foss, and Nolan T. Flynn
Department of Chemistry, St. Olaf College, Northfield, MN 55057
Cover
October 1997
Vol. 74 No. 10
p. 1195
Abstract
Electrochemical reactions depending on pH are ideal for illustrating the Nernst equation for undergraduate laboratories. An experiment utilizing the hydroquinone/quinone redox was developed which follows the potentials of the anodic and cathodic cyclic voltammetric waves as a function of solution pH. The 1mM hydroquinone solutions are prepared in phosphate/acetate mixed buffers with pH between 1-6. Cyclic voltammograms were obtained for each solution. As solution pH increases, the anodic and cathodic potentials shift cathodically as predicted by the Nernst equation. Plots of peak potential vs. pH were linear and showed that the hydroquinone/quinone redox reaction involves two electrons.
More Information
*  Citation
 Walczak, Mary M. ; Dryer, Deborah A.; Jacobson, Dana D.; Foss, Michele G.; Flynn, Nolan T. J. Chem. Educ. 1997 74 1195.
*  Keywords
 Analytical Chemistry, Laboratory, Electrochemistry, and Redox Reactions
*  History
 Created:
Last Updated:		 July 27, 1999
June 23, 2005
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