Endothermic solid–solid reactions

A photograph of a glass beaker containing a liquid, with a gas visibly rising from the top

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Observe an endothermic reaction between two solids in this demonstration or class experiment. Includes kit list and safety instructions.

Mixing solid hydrated barium hydroxide with solid ammonium chloride, students observe an endothermic reaction producing a liquid that evolves into ammonia gas, with a dramatic drop in temperature to about –20°C.

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