c) How do we get crystals of copper sulphate? Explain with the help of an activity.
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we will observe that on heating blue crystals of copper sulphate, it becomes colourless and few drops of water are seen on the test tube. then, on adding few drops of water to the heated copper sulphate, the blue colour of copper sulphate reappears.
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➢ Take some impure copper sulphate in a china dish and dissolve in minimum amount of water.
➢ Filter the solution to remove impurities.
➢ Heat the copper sulphate solution on water bath.
➢ When small crystals form on glass rods, stop heating.
➢ Allow the saturated solution to cool slowly.
➢ Crystals of pure copper sulphate are formed.
➢ Separate the copper sulphate crystals by filtration and dry.
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