(a) Why does blue vitriol change to white on heating ? (b) Write its formula.

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Solution

Blue vitriol is copper sulphate pentahydrate which is blue in colour. On heating it loses its water molecule and become anhydrous and is white in colour.
$C u S O_{4} . 5 H_{2} O \to C u S O_{4} + 5 H_{2} O B l u e v i t r i o l A n h y d r o u s$

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_{A drop of water is poured over a white powdery substance. Then it is observed that the substance turns blue. Answer the following questions :}

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_{(v) Give a reason for your answer in (iv).}

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