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I want to make hot ice. Do i need sodium acetate anhydrous or sodium trihydrate?

April 26, 2017acetate anhydrous Chemistry hot Ice Mathematics sodium

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I want to make hot ice. Do i need sodium acetate anhydrous or sodium trihydrate?

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sodium acetate trihydrate last paragraph under the applications section of the link below: Sodium acetate is also used in consumer heating pads or hand warmers and is also used in “hot ice”. When sodium acetate trihydrate crystals (melting point 58 °C) are heated to around 100 °C, they melt. When this melt cools, it gives a supersaturated solution of sodium acetate in water. This solution is capable of supercooling to room temperature, well below its melting point, without forming crystals. By clicking on a metal disc in the heating pad, a nucleation center is formed which causes the solution to crystallize into solid sodium acetate trihydrate again.