Explain two ways by which table salt can be obtained from sea water.?

Question

Help Me Please and thanks who answer my first question ...

Answer 1

One way to do it is evaporate the seawater and the water will be left behind ,an other method is distillation in which the water will be boiled and the vapours will be condensed by a condenser u would obtain pure water as well as salt left behind

Answer 2

evaporation and crystallisation

Answer 3

A little addition to previous answers.  Distillation and evaporation are the same.  The water evaporates and leaves the salt behind regardless of whether you recondense the water vapor.  Reverse osmosis will concentrate the salt, but not produce solid salt.   Another way to get the solid salt without evaporation of the water would be to add an organic solvent that is miscible with water.  THF or any alcohol would do.  So would acetone or acetonitrile.  The most likely and cheapest choice would be alcohol (methyl or ethyl).  When you add the solvent to the water, the salt becomes insoluble.  It's a good way to do it, the salt will precipitate out of solution as a nice, fine granular solid.  Also, some of the less desirable salts in seawater (it also contains some  heavy metals, not just sodium) will stay dissolved because there is so little of them, so this method will give a more pure sodium chloride (table salt).  

Answer 4

1. Remove the water from the salt by evaporation or distillation.

2. Remove the salt from the water by reverse osmosis