A good demonstration to show an endothermic process.

Stoichiometric quantities of solid barium hydroxide-8-water and solid ammonium thiocyanate are mixed in a conical flask. Reaction takes place to produce a liquid, and the temperature drops to below -25°C

Place the beaker with the reaction mixture on top of a mat with some water between and the beaker will freeze to the mat.

A Cool Experiment

A Cool Experiment – Risk Assessment