Question

Give chemical equation to show the change that occur when green coloured ferrous sulphate crystals are headed. Mention the change observed as well as reason for this change

Answer 1

Answer:

Ferrous sulphate is basically a hydrated salt. The most commonly available form of hydrated ferrous sulphate contains seven molecules of water of crytsallisation and therefore it is represented by the chemical formula FeSO4.7H2O. This salt is blue-green in colour. On heating it loses the seven molecules of water of crystallisation and forms anhydrous ferrous sulphate, which is greenish white in colour. When anhydrous ferrous sulphate is further heated, it decomposes to give sulphur dioxide, sulphur trioxide and ferric oxide (Fe2O3), which is reddish brown in colour. Due to release of sulphur dioxide a choking, pungent odour is also observed.