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Describe the method to obtain salt from sea water.
Seawater contains many salts mixed in it. One of them is a common salt. When seawater is allowed to stand in shallow pits, sunlight evaporates the water and slowly turns it into water vapour.
In a few days, the water evaporates completely, leaving behind the solid salts. Common salt is then obtained from this mixture of salts by further purification.
[Extra information:
Through the process of evaporation, salt can also be obtained from seawater at home. This can be done by putting seawater in a shallow container and then heating it. The surface area of the container or pit should be large as the rate of evaporation is directly proportional to the area. This evaporation method is widely used near sea areas.
Other methods such as reverse osmosis, electrodialysis, and certain chemicals can also be used to obtain salt from seawater.]
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