Copper(II) sulfate crystals are blue. They are produced by adding an excess of copper(II) oxide to sulfuric acid. The mixture is heated while being stirred. It is then filtered, and the filtrate is left to evaporate, which forms blue crystals. Why is filtration required?
- Ato remove soluble impurities
- Bto remove sulfuric acid
- Cto remove the blue crystals
- Dto remove unreacted copper(II) oxide