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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > January  >
Laboratory Experiments
The Complexometric Determination of Calcium and Magnesium in Limestone Using a Laser Photometer for Endpoint Identification
Daniel M. Mossman, Robert G. Kooser, and Lawrence E. Welch
Knox College, Galesburg, IL 61401
Cover
January 1996
Vol. 73 No. 1
p. 82
Abstract
An alteration of the classic complexometric titration of calcium and magnesium with EDTA was made to incorporate a laser photometer for endpoint detection. The photometer utilized a He-Ne laser, which allowed the red to blue transition of the calgamite indicator to be followed by monitoring the change in beam absorbance. A photodiode and an inexpensive computer interface were used to record the intensity of the transmitted laser beam as a function of time. This method makes the experiment much more accessible for students suffering from color blindness.
More Information
*  Citation
 Mossman, Daniel M.; Kooser, Robert G.; Welch, Lawrence. J. Chem. Educ. 1996 73 82.
*  Keywords
*  History
 Created:
Last Updated:		 9/25/1999
5/22/2006
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