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Sai Abhiram from The Hyderabad Public School, asked a question
Subject: Science , asked on 27/5/13

what is the colour of feso4.7h2o crystals ? how does this colour changes upon heating ?

give balanced chemical equation for the changes ?

EXPERT ANSWER

Kirti Gogia , Meritnation Expert added an answer, on 29/5/13

Ferrous sulphate is blue-green in colour. On being heated, it loses water of crystallisation and is converted to anhydrous ferrous sulphate. The anhydrous ferrous sulphate on further heating decomposes to ferric oxide, sulphur dioxide and sulphur trioxide. Ferric oxide is reddish brown in colour. This is an example of decomposition reaction. Following is the equation for the reaction

 

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Raksha Undefined From Our Own English High School, added an answer, on 27/5/12
70 helpful votes in Science

2FeSO4(s)------Heat----> Fe2O3(s) + SO2(g) + SO3(g)

The colour of FeSO4 crystals is pale green.When it is heated, FeSO4.7H2O first loses its water of crystallisation. These pale green crystals then decompose to form Ferric Oxide, Sulphur dioxide and sulphur trioxide. These gases escape inthe atmosphere, but the ferric oxide remains and shows the brown colour crystals.

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Heena Dua , added an answer, on 28/5/12
1 helpful votes in Science

light green

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