The Chemical EducatorISSN: 1430-4171 (electronic version) Abstract Volume 6
Issue 4 (2001) pp 221-222 A Colorful Catalysis DemonstrationCiro S. Parraga, Steven D. Brown, and Thomas G. Richmond* Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 Published online: 8 June 2001 Abstract. A simple, yet colorful, homogeneous catalysis demonstration is reported. When concentrated H2O2 is added to a yellow-orange aqueous solution of Fe3+, the solution turns black in color. After a brief induction period, exothermic decomposition of H2O2 ensues with the evolution of oxygen gas. As the reaction subsides, the solution returns to the original yellow-orange color. These color changes demonstrate one of the most important (and often most misunderstood by first-year students) concepts of catalysis—although a catalyst may be altered as it participates in a reaction, it is not consumed.
Key Words: Laboratories and Demonstrations; general chemistry; catalysis; exothermic (*) Corresponding author. (E-mail: Richmond@chemistry.utah.edu) Article in PDF format (271 KB) HTML format Issue date: August 3, 2001 |