Question

Salt is obtained from seawater by………….?

Answer 1

Hint: When molecules of a liquid gain energy then their kinetic energy increases and they leave the surface of the liquid and finally the liquid dries up. This phenomenon is widely used in household activities like drying of clothes.

Complete step by step solution:
Salt is a major constituent of sea and ocean water. It is formed by the interaction of sodium and chlorine ions in the water. Sea water has large quantities of salts dissolved in them. This salt is widely used in food and other purposes.
Salt from sea water is obtained by the process of evaporation.

Evaporation is defined as the process of conversion of a liquid into its gaseous form when the temperature is increased. In evaporation high energy molecules leave the surface of liquid and produce a cooling effect.

Process to obtain salt from sea water:
The sea water having high concentrations of salt is enclosed in large shallow pools. It is then allowed to stand and settle down there. The sea water evaporates due to the sun’s heat and solid salt is left behind. The left salt is collected and refined to get purified salt.

Hence, salt is obtained from sea water by evaporation.

Note: Evaporation in an endothermic process which means that liquid molecules absorb energy. Evaporation is also a surface phenomenon which means that it occurs on the surface of the liquid and surface molecules take part in it.