Microwave Mapping Demonstration Using the Thermochromic Cobalt Chloride Equilibrium

• Autores: Vu D. Nguyen, Kurt R. Birdwhistell
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 91, Nº 6, 2014, págs. 880-882
• Idioma: inglés
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• Resumen

  • An update to the thermochromic cobalt(II) chloride equilibrium demonstration is described. Filter paper that has been saturated with aqueous cobalt(II) chloride is heated for seconds in a microwave oven, producing a color change. The resulting pink and blue map is used to colorfully demonstrate Le Châtelier's principle and to illuminate the hot spots in the microwave oven. The demonstration is a quick, easy, and colorful way to introduce Le Châtelier's principle to students in high school or general chemistry courses.