A pure sample of copper(II) sulfate-5-water crystals can be obtained from a mixture of copper(II) sulfate-5-water with copper(II) oxide by filtration and crystallization.
When we have a mixture of copper(II) sulfate-5-water with copper(II) oxide, we have to bear in mind the copper(II) sulfate-5-water is soluble in water while copper(II) oxide is not soluble in water.
So, if we add the mixture to water and filter it, the residue is copper(II) oxide. The filtrate contains copper(II) sulfate-5-water crystals. Since the 5-water molecules are lost on heating, the solid is recovered by crystallization rather than by evaporation to dryness.
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