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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > January  >
In the Laboratory
Sweet Chemistry
Benedict Aurian-Blajeni
Science Department, BOOST, Naval Education and Training Center, Newport, RI 02841

Jonathan Sam and Michael Sisak
Science Department, Naval Academy Preparatory School, Newport, RI 02841

Cover
January 1999
Vol. 76 No. 1
p. 91
Abstract
This laboratory exercise is an introduction to spectrophotometry suitable for college freshmen and high school students. It involves food dyes and brown M&M candy. The spectra of "primary" dyes are measured and represented graphically as absorbance vs wavelength to show that minimum absorption of light occurs in the spectral region corresponding to the color of the dye. The spectra of dye combinations illustrate the fact that some common colors are actually mixtures of colors. Finally, the Beer-Lambert law is verified by using the single-wavelength absorbance (620 nm, blue) of mixtures. This project illustrates the absorption of light by substances and its dependence on wavelength, the change of light absorption with the concentration of dissolved substance (Beer-Lambert law), and the explicit correspondence of colors with spectral features. It uses safe chemicals and connects everyday objects and substances with laboratory measurements.
More Information
*  Citation
 Aurian-Blajeni*, Benedict; Sam, Jonathan; Sisak, Michael. J. Chem. Educ. 1999 76 91.
*  Keywords
 Introductory / High School Chemistry; Food Science; Laboratory Instruction; UV-Vis Spectroscopy
*  History
 Created:
Last Updated:		 June 15, 1999
June 22, 2005
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