Chemistry in Society
Chemical Analysis
Homework Two
1. Potassium nitrate is a popular fertiliser use by farmers. Describe a test that could be carried
out that would show that potassium is present in this compound.
1 mark
2. Electrolysis is the process of breaking a compound back into its elements using electricity.
Name the elements formed at the positive and negative electrodes during the electrolysis of
copper(ii) chloride.
1 mark
3. You are given an unknown solid compound. Using your knowledge of chemistry to show that
the unknown compound is ionic.
3 marks
4. A precipitation reaction is one in which an insoluble ionic compound is produce when two
ionic solutions are mixed and react.
Calcium Nitrate + Ammonium Phosphate → Calcium Phosphate + Ammonium Nitrate
Name the insoluble ionic compound form in this precipitation reaction.
1 mark
5. When a solution of barium chloride is reacted with a solution of sodium sulphate a
precipitate is formed. Write a word equation for this reaction and name the precipitate
formed.
1 mark
6. You are asked to prepare magnesium carbonate and insoluble ionic compound formed in the
reaction between potassium carbonate solution and magnesium sulphate solution.
Use your knowledge of chemistry describe how you could prepare by a dry sample of
magnesium carbonate using solid potassium carbonate and solid magnesium sulphate along
with any apparatus found in your chemistry laboratory.
3 marks
7. Insoluble salts are produce during neutralisation reactions, for example when an acid is
neutralised by an alkali.
Aluminium hydroxide + hydrochloric acid → aluminium chloride + water
Name the soluble salt form in this neutralisation reaction.
1 mark
8. When a potassium hydroxide solution is reacted with a solution of nitric acid a soluble salt is
formed. Write a word equation for this reaction and name the salt formed.
1 mark
9. You are asked to prepare copper(ii) sulphate crystals formed in the reaction between solid
copper(ii) carbonate and sulphuric acid.
Use your knowledge of chemistry describe how you could prepare experimentally a dry
sample of copper(ii) sulphate crystals using solid copper(ii) carbonate and sulphuric acid
along with any apparatus found in your chemistry laboratory.
3 marks
Total of 15 marks