A laboratory technician needs to prepare a pure, dry sample of hydrated nickel(II) sulfate crystals, NiSO4⋅7H2O\text{NiSO}_4 \cdot 7\text{H}_2\text{O}NiSO4⋅7H2O. The starting materials available include nickel(II) carbonate (NiCO3\text{NiCO}_3NiCO3) and a selection of dilute mineral acids.
Plan a detailed laboratory method to prepare pure, dry crystals of nickel(II) sulfate using nickel(II) carbonate and a suitable dilute acid.
Identify two other nickel-containing substances that could each be reacted with a suitable dilute acid to yield nickel(II) sulfate.
Do not refer to nickel(II) carbonate in your response.
40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1 Reactions of acids with metals, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5 Titrations, and 4.2.6 Strong and weak acids (HT only). Each one has a worked solution and a mark scheme showing where the marks go.