Describe how crystals of copper sulphate are prepared.

Solution

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.

Some More Questions From Physical and Chemical Changes Chapter

The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A) then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
(i) Process − A is a chemical change.
(ii) Process − B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.

Anaerobic bacteria digest animal waste and produce biogas (Change − A).
The biogas is then burnt as fuel (Change − B). The following statements pertain to these changes. Choose the correct one.

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Physical And Chemical Changes

Describe how crystals of copper sulphate are prepared.

Some More Questions From Physical and Chemical Changes Chapter

How would you show that setting of curd is a chemical change?

Explain why burning of wood and cutting it into small piece are considered as two different types of changes.