Preparation: In laboratory: 2NHCI+Ca(OH)2>CaCl2 +2H2O+2NH3(g) In industry process: N+3H2 450-500C 30MPa Fe >2NH Chemical properties: 1 Soluble in water forming monoprotic weak base NH+H,ONH·HO=NH+OH 2 Strong reducing ability 4NH3 +302(pure)>2N2 +6H2O 4NH,+50,a)24N0+6H,0 In industry process: 2NH Cl Ca(OH) CaCl 2H O 2NH (g) 4 + 2 ⎯→ 2 + 2 + 3 N2 3H2 2NH3 + ⎯450 ⎯⎯~500 ⎯ ⎯C 30MPa ⎯⎯ ⎯Fe→ Preparation： In laboratory： Chemical properties： ① Soluble in water forming monoprotic weak base ② Strong reducing ability _ NH3 +H2O NH3 H2O NH4 +OH + 4NH 5O (air) 4NO 6H O 4NH 3O (pure) 2N 6H O 2 P t 3 2 3 2 2 2 + ⎯⎯→ + + → + 800oc