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The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 12
Issue 5 (2007) pp 343-346
Demonstration of Absorbance Using a Laptop Computer for Illumination, Webcam Image Capture and Image Analysis
Kyle D. Perry, James D. Landmark and Douglas F. Stickle*
Department of Pathology & Microbiology, University
of
Nebraska Medical Center, Omaha, NE 68198, dstickle@unmc.edu
Received March 4,
2007. Accepted July 7, 2007.
Published online: 10 September 2007
Abstract. An experiment using a laptop computer with webcam color image analysis to demonstrate simple absorbance is described. The computer screen provides the illumination source. Image analysis parsing the blue color component gives a linear absorbance curve for aqueous serial dilutions of yellow food coloring. The demonstration is intended for high school chemistry laboratories where spectrophotometers are not generally available.
Key Words: Laboratories and Demonstrations; organic general; photometry; absorbance; computers
(*) Corresponding author. (E-mail: dstickle@unmc.edu)
Article in PDF format (155 KB) HTML format
Issue date: October
1, 2007
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