Question
Describe how crystals of copper sulphate are prepared.
✓
Answer
Crystals of copper sulphate are prepared by the method of crystallization. The process is as follows. A cupful of water is taken in a beaker. Few drops of dilute sulphuric acid are added to this. The water is then heated and when it starts boiling, copper sulphate powder is added with stirring. Copper sulphate powder should be added on till the solution becomes saturated. It is then filtered into a china dish and allowed to cool. The solution should be kept undisturbed. Slowly, the crystals of copper sulphate separate out.
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$3.$ Liquid waste products
$4.$ Solid waste extracted in sewage treatment
$6.$ A word related to hygiene
$8.$ Waste matter discharged from human body
Down
$1.$ Used water
$2.$ A pipe carrying sewage
$5.$ Micro-organism which causes cholera
$7.$ A chemical to disinfect water
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