fertilisers Flashcards
1
Q
what are in NPK fertilisers
A
nitrogen, potassium, phosphorus
2
Q
how is phosphate rock treated 1
A
with nitric acid to produce phosphoric acid + calcium nitrate.
the phosphoric acid is neutralised with ammonia to produce ammonia phosphate
3
Q
how is phosphate rock treated 2
A
with sulphuric acid to produce single superphosphate, as mixture of calcium phosphate and calcium sulphate
4
Q
how is phosphate rock treated 3
A
with phosphoric acid to produce triple superphosphate, which is calcium phosphate
5
Q
how can ammonia from the haber process be used as a fertiliser
A
in liquid form
