Question

What happens when blue vitriol is heated

Answer 1

Dear student,

Blue vitriol (copper sulphate ) is blue in colour as it contains 5 molecules of water of crystallization (chemical formula CuSO₄.5H₂O).When it is heated, it loses water of crystallization and becomes anhydrous CuSO₄which is grey- white in colour.
The reaction is written as follows:

$$\begin{gathered} CuS{O}_4.5H_{2}O\stackrel{∆}{\to }CuS{O}_4+5H_{2}O \\ BluevitrolCopperWater \\ sulphate \end{gathered}$$

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