Separation Methods - Cleaning Water - Seperation of Substances Video Lecture - Class 6

good morning children in this lesson we
will learn about methods of cleaning
water water is essential for all the
living things we cannot live without
water right we cannot drink polluted
water as it contains harmful bacteria
which can cause many diseases the
insoluble impurities can be removed by a
few methods first let us look at a
simple process called sedimentation in
this method we keep the water
undisturbed for some time the insoluble
particles settle down at the bottom
leaving the clear water on the top this
process is called sedimentation and the
insoluble particles settled at the
bottom are called sediments the clean
water obtained from the earlier process
of sedimentation is then poured into
another container the sediments are left
behind this is known as decantation
some insoluble impurities keep floating
on the surface of the water how do we
remove them let us see another method
for it the impure water is poured into
another container through the filter
cloth so what is filter the filter has
tiny holes through which water passes
but impurities are left behind this
process is known as filtration
how do we remove soluble impurities
soluble impurities like salt cannot be
removed by the method shown earlier like
sedimentation or filtration as they get
dissolved in the water let us see a
method to remove soluble impurities in
this process we boil the water the water
evaporates to become water vapor the
salt is left behind this process of
changing water into water vapors is
called evaporation
now how do we collect the water vapor
the evaporated water that is water vapor
is then cooled out or condensed in a jar
to get pure water this process of
evaporation and condensation is called
distillation distillation consists of
two steps step number one evaporation in
this step the water is evaporated into
steam in a distillation flask step
number two condensation in this step the
water vapor is converted into water by
passing it through the condenser
condenser is kept cooled by circulating
cold water water formed this way is
purest and is called distilled water
boiling is another simple method to
remove the germs from the water
do you know how do you get clean
drinking water at home the water
reaching our homes is first cleaned in
town water works before it is applied to
our homes the following processes are
used sedimentation water is first
allowed to stand enlarged sedimentation
tanks where the large insoluble
particles settle down at the bottom
filtration water is then filtered
through sand beds where small insoluble
particles are filtered chlorination
chlorine is added in water to kill the
germs
here you can see coordination process in
a town water supply plant the purified
water is then carried in the underground
pipes and tabs to our homes
the water which is suitable for drinking
is called portable water so a lot of
work needs to be done before the potable
water reaches our home as we saw for
removing suitable impurities we can use
sedimentation decantation and filtration
methods for removing soluble impurities
we can use the distillation process
what are the ways of purifying or
cleaning water at our homes here we can
see methods of cleaning water used in
our homes the simplest method is by
boiling water purification is also done
by adding some chemicals like chlorine
to kill the germs nowadays various small
filtration machines are also used at
home to purify the water for drinking
water is very precious for all living
things we should not waste water