Question

Differentiate between hydrated salt and anhydrous salt.

Answer 1

some salt crystallise out from their saturated aqueous solution with a definite number of molecules of water. such salt are known as hydrated salt.


Anhydrous salt is the substance which do not contain water molecules.

Answer 2

Hydrated salts have water within their crystals when the crystals are formed from water; an anhydrous salt is where the crystal has had the water driven out. Water of crystallisation occurs for two reasons. The first, the ion has a strong electric field and it polarises water such that the water tends to pack around the ions. (When the field from a charge polarises another material, there is an attractive force between them, which is why rods charged electrostatically will pick up light particles, like small pieces of paper.) When the salt crystallises, the ions take the water with them, and adopt some structure where even more water
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