Water and its impurities
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Transcript of Water and its impurities
WATER AND ITS IMPURITIES
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 .
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.
Types of Impurities
Soluble Impurities
Impurities that can be dissolved in water are called Soluble Impurities.
Examples are-Salt,any other chemical.
Insoluble Impurities
Impurities that cannot be dissolved in water are called Insoluble Impurities.
Examples-Sand,Mud.
Removing Soluble Impurities from water
EvaporationIt is the process of turningWater into vapours.
DistillationThe process of purifying waterby heating and cooling.
Removing insoluble impurities from water
Sedimentation Decantation Filtration
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.
Purifying drinking water
After removing soluble and insoluble impurities,drinking water is purified by two process i.e. ‘Boiling’ and ‘Chlorination’.
REFRENCE SLIDE
N.C.E.R.T Book Google Images