how does The Warmer (a heart full of water with a sodium acetate coin in it) actually work? What are the chemical reactions that take place?

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how does The Warmer (a heart full of water with a sodium acetate coin in it) actually work? What are the chemical reactions that take place?

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The water is saturated with sodium acetate and the “coin” when clicked is a nucleation point for the precipitation of solid sodium acetate trihydrate. That is an exothermic physical process that releases heat. There are no chemical reactions occurring.