- Ammonia is a weak alkali. When dissolved in water, the molecules undergo partial ionisation.
- As a weak alkali, it can neutralise acids to form salts.
- Ammonia gas is produced on an industrial scale by the reaction between nitrogen and hydrogen called Haber Process.
- Nitrogen is obtained industrially by the fractional distillation of liquid air.
- Hydrogen is obtained from the petroleum by cracking of oil (see Unit 11).
- N2(g) + 3H2(g) -> 2NH3(g) ∆H = -184 kJ
- Conditions : High temperature of 450oC, 200 atmospheric pressure, finely divided iron catalyst