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"Iodine clock" (translated as "iodine clock reaction") is a chemical reaction often used to demonstrate chemical kinetics in classrooms. The reaction involves a reaction between iodide ions and persulfate ions in the presence of acid, which produces iodine molecules that react quickly with thiosulfate ions to form iodide ions again. The disappearance of the blue color of the iodine molecule in the reaction solution is used to measure the rate of reaction. The name "clock" comes from the fact that the reaction time can be adjusted by changing the concentration of the reagents, making it possible to time the reaction and determine its rate.
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