The Haber process is used to make ammonia, NH3.
N2 + 3H2 ⇌ 2NH3
The reaction reaches a dynamic equilibrium.
Ammonia is used to make fertilisers.
Fertilisers usually contain nitrogen.
Name the two other elements that fertilisers usually contain.
........................................ and ..........................................
Ammonium sulfate is a salt used as a fertiliser.
Ammonium sulfate can be made in a laboratory in a batch process.
Ammonia solution is titrated with dilute sulfuric acid to make a solution of ammonium sulfate, as shown in the diagram.
Describe how you would make dry crystals of ammonium sulfate from ammonium sulfate solution.
Calcium sulfate is another salt.
A student made some calcium sulfate.
Look at the method he used:
- pour 100 cm3 of calcium nitrate solution into a beaker
- add drops of sodium sulfate solution until a precipitate appears
- allow the precipitate to settle to the bottom of the beaker
- pour off the liquid
- use a spatula to transfer the solid calcium sulfate onto a piece of filter paper.
Describe and explain two ways that the student could improve his method to increase the amount of pure, dry calcium sulfate made.
1 ........................................................
2 ........................................................
Did this page help you?