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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > October  >
In the Laboratory
Determining the EDTA Content in a Consumer Shower Cleaner. An Introductory Chemistry Laboratory Experiment
Willis A. Weigand
Department of Chemistry, Pennsylvania State University Altoona College, Altoona, PA 16601-3760
Cover
October 2000
Vol. 77 No. 10
p. 1334
Abstract
At Altoona College, Chemistry 11 is offered to students as a preparatory course for the University's Chemical Principles course, Chem 12. A relevant laboratory is a source of motivation for the students to learn the chemistry. One way of making the laboratory relevant is to analyze the chemical components of consumer products. Several new shower-cleaning products have been introduced, which advertise that cleaning the shower is no longer necessary. The cleaners work using a combination of surfactants, alcohols, and a chelating agent. The Web site of a popular shower cleaner lists EDTA (ethylenediamine tetraacetate ion) as the chelating agent. The classic EDTA/calcium complexometric titration can be used to determine the EDTA content of the cleaner. This article describes the experiment to determine the EDTA content in a shower-cleaning product.
Supplement
Student information and instructor notes are available as supplemental material.
*  Contents JCE2000p1334W.doc (Microsoft Word 8.0, Macintosh)
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*  Citation
 Weigand, Willis A. J. Chem. Educ. 2000 77 1334.
*  Keywords
 Consumer Chemistry; Introductory / High School Chemistry; Laboratory Instruction; Nonmajor Courses; Titrimetry
*  History
 Created:
Last Updated:		 September 22, 2000
August 31, 2005
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