Oscillating Reaction: Briggs-Rauscher - Reaction Monitored with Electrodes Still Images A solution of malonic acid, starch indicator, and manganese(II) catalyst is added to a solution of hydrogen peroxide, iodate, and sulfuric acid. The electrical potential of the solution is monitored with a platinum electrode attached to a strip chart recorder. Each color change is accompanied by a change in voltage. As the reaction proceeds, the time between color and voltage changes increases. Eventually the color oscillations will no longer be observed, and the voltage oscillations will become very small. The generation of iodine, however, will continue until one of the reactants is used up. 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 9 10 11 12 13 14 Back to the topic
A solution of malonic acid, starch indicator, and manganese(II) catalyst is added to a solution of hydrogen peroxide, iodate, and sulfuric acid. The electrical potential of the solution is monitored with a platinum electrode attached to a strip chart recorder. Each color change is accompanied by a change in voltage. As the reaction proceeds, the time between color and voltage changes increases. Eventually the color oscillations will no longer be observed, and the voltage oscillations will become very small. The generation of iodine, however, will continue until one of the reactants is used up.
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© 1999 Division of Chemical Education, Inc., American Chemical Society. All rights reserved.
