(a) What is the colour of ferrous sulphate crystals? How does this colour change after heating?
The colour of Ferrous Sulphate is green.On heating the colour of the Ferrous Sulphate first changes to white and then to brown.This is a thermal decomposition reaction.The white coloured substance is anhydrous Ferrous Sulphate and brown coloured substance is Ferric Oxide.
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On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate(FeSO4) is formed. So their colour changes from light green to white. On furtherheating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3).
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