Required practical – making salts from an insoluble base

• State the acid, and insoluble base we can use to produce copper sulfate

  Copper oxide or copper carbonate

  Sulfuric acid
• Explain how we can ensure all the acid has reacted when adding an insoluble base to it.

  Test the solution with a pH probe. If it is acidic, add more insoluble base and stir.
• Describe how we remove the salt solution from the excess insoluble base

  Filter it. The insoluble base forms the residue, and the soluble salt forms the filtrate solution
• Explain why we had to warm the acid before the reaction

  As the base is insoluble, the heat will increase solubility so it reacts with the acid.
• How do we form crystals from the filtrate?

  Crystallisation: heat to start evaporating the water until crystals start to form. Then leave overnight for the remaining water to evaporate. Finally, dry using filter paper gently.