(a) Describe an activity to obtain pure copper sulphate from its impure sample.
(b) Draw a flow-chart to explain how water purification system in water works.
CBSE Class IX Science LA (5 Marks)
Answers
Activity :
➢ 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.
(b) Reservoir sedimentation tank to allow solids to settle
↓
Loading Tank to sediment the suspended impurities
↓
Filtration tank
↓
Chlorination to kill bacteria
↓
Supply
Answer:
(a) Pure copper sulphate can be obtained by the crystallization method.
Activity :
➢ Take some impure copper sulphate in a china dish and dissolve in a minimum amount of water.
➢ Filter the solution to remove impurities.
➢ Heat the copper sulphate solution on the 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.
(b) Reservoir sedimentation tank to allow solids to settle
↓
Loading Tank to sediment the suspended impurities
↓
Filtration tank
↓
Chlorination to kill bacteria
↓
Supply
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