This slide will help in understanding impurities of water.

1. WATER AND ITS IMPURITIES

2. Importance of Water
 Almost 71 % of earth is covered with water in
the form of oceans,rivers,lakes etc.
 But very less amount of water is potable i.e.
fit for human consumption .

3. Water Impurities
 The substances that pollute water are called
‘Water Impurities’.
 Water is being polluted by throwing wastes
into rivers,oil leakage by water transport etc.

4. Types of Impurities

5. Soluble Impurities
 Impurities that can be dissolved in water are
called Soluble Impurities.
 Examples are-Salt,any other chemical.

6. Insoluble Impurities
 Impurities that cannot be dissolved in water
are called Insoluble Impurities.
 Examples-Sand,Mud.

7. Removing Soluble Impurities
from water
 Evaporation
It is the process of turning
Water into vapours.
 Distillation
The process of purifying water
by heating and cooling.

8. Removing insoluble impurities
from water
 Sedimentation
 Decantation
 Filtration

9. Definitions of process of
removing insolube impurities
 Sedimentation-The process of settling or
being deposited as a sediment.
 Decantation-It is the process for the
separation of mixtures,by removing a layer of
liquid,generally one from which a precipitate
has settled.
 Filtration-The process of removing
something unwanted from a liquid by using a
filter.

10. Purifying drinking water
 After removing soluble and insoluble
impurities,drinking water is purified by two
process i.e. ‘Boiling’ and ‘Chlorination’.

11. REFRENCE SLIDE
 N.C.E.R.T Book
 Google Images