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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > April  >
In the Laboratory
Dissolution Kinetics of Solids: Application with Spherical Candy
Guy Beauchamp
Department of Chemistry, Collège de l'Outaouais, Hull, PQ J8Y 6M5, Canada
Cover
April 2001
Vol. 78 No. 4
p. 523
Abstract
This economical and safe kinetics experiment involves the rate of dissolution of a spherical candy in water. The 2/3 order with respect to the measured mass gives students a practical example of a non-integer order usually only encountered in textbooks in free radical processes. Insight is given to the fact that in a dissolving solid sphere, the radius recedes at constant speed. This experiment also may be useful as an introduction to the concepts of solubility and diffusion in a general chemistry course. Temperature dependence on dissolution rate constants revealed an energy of activation of 23 kJ/mol (±1 kJ/mol) for different hard candies.
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Notes for the instructor and the student handout are available.
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*  Citation
 Beauchamp, Guy. J. Chem. Educ. 2001 78 523.
*  Keywords
 General Chemistry; Kinetics; Laboratory Instruction; Solids
*  History
 Created:
Last Updated:		 March 2, 2001
August 31, 2005
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