Oscillating Reaction: Briggs-Rauscher - With Stirring Still Images A solution of malonic acid, starch and manganese(II) catalyst is added to a solution of hydrogen peroxide, iodate, and sulfuric acid. A reaction involving many steps occurs. One step generates iodine, oxygen gas, and carbon dioxide gas. When the concentration of iodine gets large enough, triiodide is generated and forms a blue complex with starch. A second step uses up iodine, reversing the formation of the blue complex. As the iodine concentration oscillates, the color oscillates from colorless to amber to blue. You can get at large JPEG versions of the images by means of the following links. 0 1 2 3 4 5 6 7 8 Back to the topic
A solution of malonic acid, starch and manganese(II) catalyst is added to a solution of hydrogen peroxide, iodate, and sulfuric acid. A reaction involving many steps occurs. One step generates iodine, oxygen gas, and carbon dioxide gas. When the concentration of iodine gets large enough, triiodide is generated and forms a blue complex with starch. A second step uses up iodine, reversing the formation of the blue complex. As the iodine concentration oscillates, the color oscillates from colorless to amber to blue.
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© 1999 Division of Chemical Education, Inc., American Chemical Society. All rights reserved.
