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ERIC Number: EJ820770
Record Type: Journal
Publication Date: 2007-Sep
Pages: 3
Abstractor: As Provided
Reference Count: 10
ISSN: ISSN-0021-9584
Redox Titration of Ferricyanide to Ferrocyanide with Ascorbic Acid: Illustrating the Nernst Equation and Beer-Lambert Law
Huang, Tina H.; Salter, Gail; Kahn, Sarah L.; Gindt, Yvonne M.
Journal of Chemical Education, v84 n9 p1461-1463 Sep 2007
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)[subscript 6]][superscript 3-], to ferrocyanide, [Fe(CN)[subscript 6]][superscript 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. (Contains 1 table and 2 figures.)
Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A