C1 H - Sample set 1 Q4
4) The method used to prepare a salt depends on its solubility in water.
(a) Complete Figure 9 by placing one tick in each row to show whether the salt is soluble or insoluble. (2)
(a) Complete Figure 9 by placing one tick in each row to show whether the salt is soluble or insoluble. (2)
(b) Lead nitrate solution mixed with sodium sulfate solution forms lead sulfate as a precipitate.
The theoretical yield of lead sulfate for this reaction was 2.85g.
The actual yield of lead sulfate obtained was 2.53g.
Calculate the percentage yield of lead sulfate in this experiment.
Give your answer to two significant figures. (3)
The actual yield of lead sulfate obtained was 2.53g.
Calculate the percentage yield of lead sulfate in this experiment.
Give your answer to two significant figures. (3)
percentage yield = ...............................................................................%
(c) The method used to make the lead sulfate is:
- pour 100 cubic cm lead nitrate solution into a beaker
- add drops of sodium sulfate solution until a precipitate is seen
- allow the precipitate to settle to the bottom of the beaker
- pour off the liquid
- use a spatula to transfer the solid lead sulfate onto a filter paper
(d) Ammonium nitrate is produced from ammonia and nitric acid on a large scale in industry.
Ammonium nitrate can also be made in the laboratory by titrating ammonia solution with dilute nitric acid.
Ammonium nitrate crystals can then be obtained by evaporating off some of the water from the solution.
Give two reasons why this laboratory method is not suitable for use on a large scale in industry. (2)
(Total for Question 4 = 11 marks)
Give two reasons why this laboratory method is not suitable for use on a large scale in industry. (2)
(Total for Question 4 = 11 marks)