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Redox Titration of Ferricyanide to Ferrocyanide with Ascorbic Acid: Illustrating the Nernst Equation and Beer–Lambert Law

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Tina H. Huang , Gail Salter , Sarah L. Kahn and Yvonne M. Gindt

Department of Chemistry, Lafayette College, Easton, PA 18042

J. Chem. Educ., 2007, 84 (9), p 1461

DOI: 10.1021/ed084p1461

Publication Date (Web): September 1, 2007

Abstract

We have developed a simple, resilient experiment that illustrates the Nernst equation and Beer–Lambert law for our second-semester general chemistry students. In the experiment, the students monitor the reduction of ferricyanide ion, [Fe(CN)₆]^3-, to ferrocyanide, [Fe(CN)₆]^4-, both electrochemically and spectrophotometrically upon titration with ascorbic acid. The Nernst equation was used to calculate the standard reduction potential of the redox couple at pH 7 and the number of electrons transferred. The standard reduction potential determined experimentally by our general chemistry students corresponds well to the values reported in literature, and the calculated number of electrons transferred between ferricyanide and ferrocyanide was within 5% of one. The dramatic visual observation of the color change during the course of the titration is a major advantage of this experiment.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Curriculum

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Coordination Compounds

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Conductimetric Titrations: A Predict−Observe−Explain Activity for General Chemistry
K. Christopher Smith, Etinosa Edionwe, and Bayyinah Michel
Journal of Chemical Education2010 87 (11), 1217-1221
- Conductimetric Titrations: A Predict−Observe−Explain Activity for General Chemistry
  K. Christopher Smith, Etinosa Edionwe, and Bayyinah Michel
  Journal of Chemical Education2010 87 (11), 1217-1221
  A predict−observe−explain framework is used to explore conductimetric titrations of a hydrochloric acid−sodium hydroxide (strong acid−strong base) and an acetic acid−sodium hydroxide (weak acid−strong base) system in which all components are soluble. In ...
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