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While washing my hands with soap I added some hand sanitizer just because it was right there on the counter and couldn't resist mixing them... Ha! However, when I added the hand sanitizer it heated up for a moment and then cooled back down. Why does this happen?

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Hand sanitizers are generally ~50% - 70% ethanol or isopropanol. When these alcohols mix with water, they may release heat. Starting at room temperature, mixing ~100% ethanol with an equal volume of water will raise the temperature of the mixture ~8 0C.

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It sounds like some type of exothermic reaction happened between the hand sanitizer which is primarily alcohol, and the soap.

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