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ERIC Number: EJ820750
Record Type: Journal
Publication Date: 2007-Mar
Pages: 3
Abstractor: As Provided
Reference Count: 10
ISSN: ISSN-0021-9584
An Inexpensive Kinetic Study: The Reaction of FD&C Red #3 (Erythrosin B) with Hypochlorite
Henary, Maher M.; Russell, Arlene A.
Journal of Chemical Education, v84 n3 p480-482 Mar 2007
Kinetics constitutes a core topic in both the lecture and laboratory components of lower- level chemistry courses. While textbook examples can ignore issues of time, temperature and safety, the laboratory can not. Reactions must occur slowly enough to be detected by students, occur rapidly enough for data collection in the few hours assigned to a laboratory period, be safe enough to be handled by students, and be simple enough to provide easily interpreted data. Few reactions meet these restrictions. We report here a new, inexpensive ([tilde]5 cents/student), environmentally benign system involving the reaction of FD&C Red #3 and hypochlorite. Students use a desktop visible spectrophotometer to quantitatively follow the rate of disappearance of the colored reagent under a variety of initial conditions. The first-order reaction in both dye and bleach yields simple data that students can easily process and graph using spreadsheet software to obtain the rate constant and the rate law. (Contains 2 figures, 1 table, and 1 note.)
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; Postsecondary Education
Audience: Students; Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A