Page 113 - Science Class 6 Times Publication

Activity 10.3

To separate the mixture of sand and water
Materials required

Two beakers, a glass rod, a mixture of sand and water, etc.

Sedimentation
Decantation
Procedure

Take a mixture of sand and water in a beaker and stir it with a glass
rod. Then remove the glass rod and leave the mixture undisturbed
for 5-10 minutes.

Observation

The sand particles settle down at the bottom of the beaker. The clear

water forms the upper layer.
Conclusion

Suspended heavier impurities can be separated by settling down at
the bottom of the vessel.

In the above activity, the process of settling down of the heavier
and insoluble particles of a mixture is called sedimentation. After
sedimentation, the clear water can be poured into another beaker
without disturbing the settled sand. This process is called decantation.
Hence, the process of transferring the clear liquid without disturbing
the settled insoluble impurities is called decantation.
Filtration

This method is used to separate the very ne particles of an insoluble
solid from a liquid. It can also be used to separate the mixture of two

Times' Crucial Science and Environment 109 Book 6