ERIC Number: EJ923703
Record Type: Journal
Publication Date: 2011-Feb
Pages: 3
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: N/A
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.)
Descriptors: Chemistry, Science Instruction, Science Experiments, Scientific Principles, Metallurgy, Science Laboratories
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: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A