Soil

Question 1

Lighting Nitrogen Fixation Equations

Answer 1

N2 + O2 —> 2NO
2NO + O2 → 2NO2
H2O (from rain/soil water) + NO2 → HNO3 (nitric acid) + HNO2 (nitrous acid)
HNO3 + H2O → (equil) H3O+ + NO3- (nitrate)

Question 2

Nitrogen Fixing Bacteria

Answer 2

Nitrogen Fixing Bacteria
N2 -> NH3
If in acidified soil N2 → NH4+ (already soluble)
Then, Nitrifying bacteria…
NH3 → NO2- (nitrite)
NO2- → NO3- (nitrate)

Question 3

Haber Process of Making Fertiliser

Answer 3

N2 + 3H2 -iron catalyst -> (equi) 2NH3