Sea water has salt dissolved in it . You know that pure water can be obtained from sea water by distillation.However, this method is not used to get drinking water from sea water.What do you think is the reason?

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Solution

In sea water there is not only NaCl present but also number of other type of salts and minerals along with some other things. These all can not be separated only by distillation.
Sea water can be used as drinking water by separating NaCl from water by Reverse Osmosis followed by ultra filtration

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