how does a pure salt obtains on a large scale?
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Sodium chloride is a white solid. It is obtained on a large scale by evaporation of sea water. ... The crude salt is dissolved in water, the impurities are filtered off and the pure sodium chloride is precipitated out from the solution by passing chlorine gas.
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The process of evaporation is used on a large scale to obtain common salt from seawater. Sea water is trapped in shallow lakes and allowed to stand there. The heat of Sun gradually evaporates water in the shallow lakes and and common salt is left behind as a solid.
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