Archive Flashcards
1
Q
For the industrial preparation of nitric acid from nitrogen, give the chemical reactions and the conditions under which they take place. (6 marks) [DSE Sample Paper]
A
To make NH3
- Purified N2 and H2, Fe catalyst, 450°C and 200 atm (1)
- N2 + 3H2 ⇌ 2NH3 (1)
To make NO2
- NH3 + excess O2, Pt catalyst, 400-900°C (1)
- 4NH3 + O2 → 4NO + 6H2O (1)
- 2NO + O2 → NO2 (1)
Resulting mixture is passed through water:
- 4NO2 + O2 + 2H2O → 4HNO3 (1)
