Description: Endothermic reaction of barium hydroxide and an ammonium salt. Mix the two solids; they react, and the products dissolve in water of hydration. The reaction flask may be passed around for students to feel how cold it is.

This demonstration is also available on video and JCE "Chemistry Comes Alive!" vol. 3 CD-Rom.

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Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year or vol: 1 page: 10

Keywords: Solution, Endothermic, Barium Hydroxide, Ammonium Salts