A student wrote this method for preparing a pure, dry sample of copper chloride crystals.
Step 1 Measure 25 cm3 of dilute hydrochloric acid into a beaker.
Step 2 Add one spatula of copper oxide and stir.
Step 3 Filter the mixture into an evaporating basin.
Step 4 Heat the evaporating basin strongly with a Bunsen burner until all of the water has evaporated.
The sample of copper chloride made using this method was not pure. Suggest one improvement to step 2 and give the reason for your improvement.
Suggest one improvement to step 4 and give the reason for your improvement.
In step 3, a solid was left in the filter paper. Name this solid.
Name one piece of apparatus that would measure the 25 cm3 of acid in step 1 more accurately than a beaker.
40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1a Reactions of acids with metals, 4.2.1b Redox in acid-metal reactions, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5a Titrations, 4.2.5b Calculating quantities in titrations, and 4.2.6 Strong and weak acids. Each one has a worked solution and a mark scheme showing where the marks go.