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Dissolution Kinetics of Solids: Application with Spherical Candy

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Guy Beauchamp

Department of Chemistry, Collège de l''Outaouais, Hull, PQ J8Y 6M5, Canada

J. Chem. Educ., 2001, 78 (4), p 523

DOI: 10.1021/ed078p523

Publication Date (Web): April 1, 2001

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Kinetics

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

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