Question

Answer the question below, relating your answers only to salts in the following list: Sodium chloride, anhydrous calcium chloride, copper sulphate$-5-$water?
(c) By what means, other than heating, could you dehydrate copper sulphate$-5-$water and obtain anhydrous copper sulphate?

Answer 1

By adding any dehydrating agent, copper sulphate$-5-$water can be dehydrated as they remove the water of crystallization.
For example, a dehydrating agent like conc. sulphuric acid is used, it absorbs water molecules from copper sulphate pentahydrate. As all the water molecules get absorbed by sulphuric acid, the white crystals of copper sulphate are produced.