011-40705070  or  
Call me
Download our Mobile App
Select Board & Class
  • Select Board
  • Select Class
Sai Abhiram , 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

 

This conversation is already closed by Expert

  • Was this answer helpful?
  • 15
89% users found this answer helpful.
View More
Raksha Undefined , added an answer, on 27/5/12
146 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.

  • Was this answer helpful?
  • 3
71% users found this answer helpful.
Heena Dua , added an answer, on 28/5/12

light green

  • Was this answer helpful?
  • 0
50% users found this answer helpful.