A student made copper sulfate crystals from copper oxide and dilute sulfuric acid. The crystals were not dry.
Which step had the student left out?
filtering off the excess copper oxide
stirring the mixture during the reaction
warming the acid before adding the oxide
leaving the crystals in a warm place
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.