Analysis of Mouthwash

Eleanor Siegrist and Guy Anderson
Hollidayburg Area High School, Holidaysburg, PA 16648
J. Chem. Educ., 1997, 74 (5), p 567
DOI: 10.1021/ed074p567
Publication Date (Web): May 1, 1997

Abstract

Students analyze commercial mouthwash solutions in order to identify the dyes which are present and determine the alcohol content. After lowering the alcohol content by heating, a solid phase extraction tube is used to extract and separate the dyes. A spectrophotometer is used to determine the absorbent maximum in each sample of eluate and the value obtained is compared with a list of standard values. A gas chromatograph is used to determine the concentration of alcohol in the original mouthwash sample. The project was made possible through a van project which carries the instruments and resource teachers to the author's high schools.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Laboratory Instruction

Keywords (Feature):

Filtrates and Residues

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Consumer Chemistry
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  • Received: August 03, 2009

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