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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > May  >
In the Laboratory
Micelles in the Physical Chemistry Laboratory. Kinetics of Hydrolysis of 5,5'-Dithiobis-(2-nitrobenzoate) in Basic Solution
Kathryn R. Williams
Department of Chemistry, University of Florida, Gainesville, FL 32611-7200
Cover
May 2000
Vol. 77 No. 5
p. 626
Abstract
This paper describes the second in a series of laboratory experiments demonstrating the effects of micelles on physicochemical properties. The kinetics of the hydrolysis of 5,5'-dithiobis-(2-nitrobenzoate) (DTNB2-) in basic solution are studied by UV spectrophotometry. The reaction is conducted both without and with added cetyltrimethylammonium bromide (C16TAB) to observe the rate enhancement in the presence of micelles. With the conditions specified in the experiment, total reaction times are in the range of 15 seconds to 15 minutes, thus allowing several data sets to be acquired in a single laboratory period.
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The laboratory procedure and data analysis are explained in detail in the student instructions.
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*  Citation
 Williams, Kathryn R. J. Chem. Educ. 2000 77 626.
*  Keywords
 Kinetics; Laboratory Instruction; Micelles; Physical Chemistry
*  History
 Created:
Last Updated:		 March 31, 2000
August 31, 2005
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