What is the color of FeSO4.7H2O crystals? How does this color change upon heating? Give balanced chemical equation for the changes.

Hydrated ferrous sulphate (FeSO4.7H2O ) crystals are green in colour.
Upon heating it the water of crystallisation separates out and we get anhydrous ferrous sulphate which is white in colour.
$FeSO_{4} .7H_{2} O\xrightarrow{heat} \ FeSO_{4} \ +\ 7H_{2} O$
Colour changes from green to white.

On heating anhydrous copper sulphate further, we get ferric oxide, sulphur dioxide and sulphur trioxide.
Ferric oxide is reddish-brown in colour.
$2FeSO_{4} \ \xrightarrow{heat} \ \ Fe_{2} O_{3} \ +\ SO_{2} \uparrow +\ SO_{3} \uparrow $
Colour changes from white to reddish-brown.


Simply Easy Learning

Updated on: 10-Oct-2022


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