water and its impurities
TRANSCRIPT
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WATER AND ITS IMPURITIES
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Importance of Water
Almost 75 % 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 like for drinking,cooking,bathing etc.
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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.
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Types of Impurities
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Soluble Impurities
Impurities that can be dissolved in water are called Soluble Impurities.
Examples are-Salt,any other chemical.
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Insoluble Impurities
Impurities that cannot be dissolved in water are called Insoluble Impurities.
Examples-Sand,Mud.
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Removing Soluble Impurities from water
EvaporationIt is the process of turningWater into vapours.
DistillationThe process of purifying waterby heating and cooling.
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Removing insoluble impurities from water
Sedimentation Decantation Filtration
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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.
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Purifying drinking water
After removing soluble and insoluble impurities,drinking water is purified by two process i.e. ‘Boiling’ and ‘Chlorination’.
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REFRENCE SLIDE
N.C.E.R.T Book Google Images
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