Making Fertilisers

1
(No Transcript)
2
Making Fertilisers

• Useful products from the AIR!

3
Making Fertilisers

• Most fertilisers have a high nitrogen content.
• Hence they are called nitrogenous fertilisers .
• NPK fertilisers contain compounds of nitrogen,
  phosphorus and potassium

4
Making Fertilisers

• The two most common fertilisers are ammonium
  nitrate and ammonium sulphate.
• Ammonia is NH3, it is made by the Haber process
  with nitrogen from the air.

5
Making Fertilisers

• Ammonia is a strong alkali, to turn it into a
  fertiliser it has to be neutralised with an acid.

6
Making Fertilisers

• Ammonium nitrate is made by neutralising ammonia
  (a base) with nitric acid.

7
Making Fertilisers

• Ammonia nitric acid ammonium nitrate
• NH3(aq) HNO3(aq) NH4NO3(aq)

8
Making Fertilisers

• The solution is heated to evaporate the water and
  the solid ammonium nitrate is formed into
  pellets.
• The nitric acid itself is made from ammonia, this
  makes ammonia made by the Haber process very
  important for producing fertilsers.

9
Making Fertilisers

• Ammonium sulphate is made by neutralising ammonia
  (a base) with sulphuric acid.
• This provides plants with sulphur as well as
  nitrogen.

10
Making Fertilisers

• Ammonia sulphuric acid ammonium nitrate
• 2NH3(aq) H2SO4(aq) (NH4)2SO4(aq)

11
Making Fertilisers

• The Haber process makes ammonia out of hydrogen
  and nitrogen.
• The Haber process is a very important industrial
  process