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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > August  >
In the Laboratory
Cost-Effective Teacher
A Film Canister Colorimeter
James Gordon, Alan James, Stephanie Harman, and Kristen Weiss
Division of Science and Mathematics, Central Methodist College, Fayette, MO 65248
Cover
August 2002
Vol. 79 No. 8
p. 1005
Abstract
A low-cost, low-tech colorimeter was constructed from a film canister. The light source and filter monochromator was an interchangeable LED. The detector for this system was a voltage-divider circuit composed of a photoresistor in series with a fixed resistor. The student-constructed colorimeter was used to show the Beer–Lambert relationship between absorbance and concentration and to calculate the value of the molar absorptivity for permanganate at the wavelength emission maximum for the LED. Comparisons were made between this instrument and three commercial spectrometers and colorimeters.
Supplement
Detailed instructions for constructing the film canister colorimeter are available.
*  Contents MS Word document
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More Information
*  Citation
 Gordon, James; James, Alan; Harman, Stephanie; Weiss, Kristen. J. Chem. Educ. 2002 79 1005.
*  Keywords
 Inquiry-Based / Discovery Method; Instrumental Methods; Laboratory Equipment / Apparatus; Laboratory Instruction; UV-Vis Spectroscopy
*  History
 Created:
Last Updated:		 July 23, 2002
March 16, 2005
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