how does common salt (sodium chloride) crystallise out of seawater?

Answer 1

If a pan of seawater is heated by the sun or by a fire the water will evaporate and salt crystals will be left in the pan. That is the same as how any other crystallization occurs.

In Mediterranean countries with a lot of seawater and a lot of sun they have been crystallizing salt that way for thousands of years.

Answer 2

Salt is also obtained by evaporation of sea water, usually in shallow basins warmed by sunlight;[5] salt so obtained was formerly called bay salt, and is now often called sea salt or solar salt. Today, most refined salt is prepared from rock salt: mineral deposits high in edible salt.[citation needed] These rock salt deposits were formed by the evaporation of ancient salt lakes.[citation needed] These deposits may be mined conventionally or through the injection of water. Injected water dissolves the salt, and the brine solution can be pumped to the surface where the salt is collected.

Answer 3

if the sea water is colled to low temperatures, the solubility of sodium chloride in water decreases. it then crystallizes out. there is basically not much difference between the crystallization of salt from sea water or any other water/ solution

Answer 4

through evaporation of water.

Answer 5

evaporation (?)