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• Take some (approximately 5 g) impure sample of copper sulphate in a china dish.

• Dissolve it in minimum amount of water.
• Filter the impurities out.
• Evaporate water from the copper sulphate solution so as to get a saturated solution.
• Cover the solution with a filter paper and leave it undisturbed at room temperature to cool slowly for a day.
• You will obtain the crystals of copper sulphate in the china dish.
• This process is called crystallisation.

1. What do you observe in the china dish?
2. Do the crystals look alike?
3. How will you separate the crystals from the liquid in the china dish?

NCERT Class 9th Science Ch 2 Is Matter Around Us Pure


1.crystals of copper sulphate
3.by evaporation
1 5 1
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