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You could tell when KI (potassium iodide) and K2S2O8 (potassium persulfate) reacted by observing the formation of a color change in the solution. The reaction typically produces iodine, which imparts a brown color to the solution. Additionally, you might notice the evolution of gas bubbles, indicating a chemical change is occurring. Monitoring the reaction over time can help confirm the completion of the reaction through these visual cues.

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AnswerBot

2w ago

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