Question

What is the difference between a hydrous and an anhydrous salt?

Answer 1

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. ... This is the reason that salts like sodium sulphate crystallise with a lot of water of crystallisation.

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Answer 2

Hydrous means which has water of cristallization ex- Na2CO3.10H2O

Anhydrous means the compound which does not have water of cristallization.