Chemical Properties of Ammonia

1. It reacts with oxygen to release water and nitrogen.
4NH_3(g) + 3O_2(g)  →   6H₂O_(L) + 2N_2(g)

2. It acts as reducing agent –
3CuO_(s) + 2NH_3(g)  →   Cu_(g) + 3H₂O_(L) + N_2(g)

3. It acts as precipitating agent –
Pb(NO₃)_2(aq) + 2NH_3(ag) + 2H2O_(L)  →   Pb(OH)_2(s) + 2NH₂NO_3(aq)

4. It reacts with acids to form ammonium salts.
NH_3(g) + HCL_(aq) →   NH₄CL_(aq)