Question

Why does salt mix with water whereas oil not?

Answer 1

Because water molecules are polar, any liquid that does not have polar molecules—such as oil—is usually immiscible with water. ... Because the salt ions are charged, they dissolve much better in a polar solvent, which is also slightly more charged than a non-polar solvent.

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Answer 2

mixturing of substance it dependes on which liquid are they mixuring
density of water is less than oil. that's why ions of salt (NaCl) were easily seperated in water.