Description: A sodium acetate crystallization and re-solution system that is commercially available. By bending the metal disc in the bag, the sodium acetate crystalizes and gives off heat. Placing the bag in boiling water redissolves the sodium acetate, and the bag can be reused.

This demonstration is also available on video and JCE Software: "Chemistry Comes Alive!" Vol. 2 CD-Rom.

Rating:

Source: Journal of Chemical Education - Vol 68

Year or vol: 1991 page: 780

Keywords: hot pack, supersaturated solution, supersaturation,