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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > December  >
In the Laboratory
Filtrates and Residues
An Empirical Formula from Ion Exchange Chromatography and Colorimetry
Steven D. Johnson
Churchill County High School, Fallon, NV 89406
Cover
December 1996
Vol. 73 No. 12
p. 1179
Abstract
Experimental determination of the empirical formula for sodium salicylate, Nax(C7H5O3)y, using colorimetry and cation exchange. A Beer's Law plot is prepared for salicylate using 0.0050 M salicylic acid solution. Colorimetric analysis is performed on the salicylate ion in the form of an aqueous ferric complex, which is intensely violet-red, using a simple, inexpensive colorimeter constructed from readily available electronic parts and PVC pipe. Determination of sodium content is conducted using cation exchange, using simple re-usable exchange columns, followed by titration with OH-. The procedure is involved, yet has been conducted by high school chemistry students as a lab final.
More Information
*  Citation
 Johnson, Steven D. J. Chem. Educ. 1996 73 1179.
*  Keywords
 Laboratory Instruction
*  History
 Created:
Last Updated:		 August 5, 1999
February 21, 2006
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