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Iodine clock reaction

Iodine clock reaction

C028/8133

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

Iodine clock reaction. This is the start of the experiment. A clear solution of potassium iodide, sodium thiosulfate, and starch is added to a clear solution of hydrogen peroxide with sulfuric acid in the conical flask. A digital timer is set to start at this point to determine when the chemical equilibrium has been reached. The solution will then be a dark blue/black.

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