Dissolution Kinetics of Solids: Application with Spherical Candy

• Guy Beauchamp ^[1]
  1. [1] Collège de l''Outaouais, Canada
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 78, Nº 4, 2001, pág. 523
• Idioma: inglés
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• Resumen

  • 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.