Study of Compounds- Ammonia – Notes
Group 15: Nitrogen – Ammonia
Ammonia chloride, when heated with lime or caustic soda, evolves ammonia gas.
2NH4Cl + Ca(OH)2 + ®D 2NH3 + 2H20 + CaCl2
Ammonia chloride Slaked Lime Ammonia water calcium chloride
In accordance with Le Chatelier’s principle, high pressure, high pressure and low temperature favours the better yield of ammonia.
A high pressure of 200-300 atmospheres, an optimum temperature about 700k and the catalyst iron oxide along with promoter alumina are used to obtain better yields of ammonia.
N2 + 3H2 2NH3 DH= – 92.2 kJ mol-1
Nitrogen Hydrogen Ammonia
On account of the presence of one lone pair in ammonia, the geometry of the molecule is trigonal pyramidal.