Endothermic Reactions of Hydrated Barium Hydroxide and Ammonium Chloride

Materials

250 mL Erlenmeyer Flask

Bottle of Barium Hydroxide (32g - premeausred)

Bottle of Ammonium Chloride (11g - premeausred)

DI water Rinse Bottle

Small Block of Wood

Gloves and Goggles

Procedure

Place 32gms Ba(OH)2 in a 250ml Erlenmeyer flask, add 11gm NH4Cl, and shake gently to mix. In about 30 seconds, ammonia can be smelled and liquid will form in the flask.   
Wet a small wooden block with a small squirt of water and set the flask on it. The flask will freeze to the wood.

Reactions

Ba(OH)₂ * 8H₂O (s) + 2 NH₄Cl (s) --> BaCl₂ * 2H₂O (s) + 2 NH₃ (aq) + 8H₂O (l)

Waste Management

The leftover solution should be poured into a bottle and sent to EH&S as hazardous waste (Toxic).