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ERIC Number: EJ923703
Record Type: Journal
Publication Date: 2011-Feb
Pages: 3
Abstractor: As Provided
ISSN: ISSN-0021-9584
Complexation Effect on Redox Potential of Iron(III)-Iron(II) Couple: A Simple Potentiometric Experiment
Rizvi, Masood Ahmad; Syed, Raashid Maqsood; Khan, Badruddin
Journal of Chemical Education, v88 n2 p220-222 Feb 2011
A titration curve with multiple inflection points results when a mixture of two or more reducing agents with sufficiently different reduction potentials are titrated. In this experiment iron(II) complexes are combined into a mixture of reducing agents and are oxidized to the corresponding iron(III) complexes. As all of the complexes involve the iron(III)-iron(II) couple, it is the complexation or ligand effect that causes speciation of iron as different reducing agents. These experiments illustrate the stabilities of iron(III)-iron(II) complexes with EDTA, water, and "o"-phenanthroline ligands. (Contains 4 figures.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A