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Endothermic Reactions of Hydrated Barium Hydroxide and Ammonium Chloride

Procedure

Place 32g Ba(OH)2 in a 250ml Erlenmeyer flask, add 11g NH4Cl; close the flask and shake gently to mix. In about 30 seconds, liquid will form in the flask. If the flask is opened, ammonia (NH4) can be smelled. 

Wet a small wooden block with a 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)

Hazards

Both barium hydroxide [Ba(OH)2] and ammonium chloride [NH4Cl] are toxic as well as irritating. Open and weigh both in the hood and take only the  measured quantities to the demonstration area in closed containers.

Waste Management:

Close the demonstration flask and return to the stockroom. The waste from this demonstration will be labeled for pickup by EH&S (Toxic). 





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Last Updated: 5/23/02