blue crystals of copper sulphate on heating in a dry test tube become colourless give reasons in short answer
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On heating the blue salt of copper sulphate it is seen that it becomes colourless. This is so because the salt strongly looses all the water of crystallization, which leads to the formation of anhydrous copper sulphate which is white in colour. The salt containing water crystallization is called hydrated salts.
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They turn colourless due to the formation of anhydrous copper sulphate ( lacking water) .
on further heating , it left behind a reddish brown residue of ferric oxide and sulphur dioxide and sulphur trioxide is formed.
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