(i) Iron nails are separated from the mixture by handpicking.
(ii) The mixture is allowed to stand for some time. Two separate layers will be formed. The top layer of oil is decanted to separate it from the mixture.
(iii) Pour this liquid into a kettle, close its lid and heat it. Now take a metal plate with some ice on it and hold this plate just above the spout of the kettle. The steam coming out condenses when comes in contact with the metal plate and forms water and salt is left behind.