Steps for the separation of iron nails, salt, oil, and water

Iron nails are separated from the mixture by using magnets. Then by using decantation oil and water is separated. Oil being lighter forms the upper layer in the beaker and we can decant off the upper layer of oil.

Now the mixture contains dissolved salt and water. Salt can be obtained from the water by the process of evaporation. The water present in the salt solution will form water vapor and then the salt is left behind.