Question

What is observed when ferrous sulphate is heated in a test tube .write the equation involved in this chemical reation and also write the name of type of reaction?

Answer 1

When FeSO4.7H2O is heated,it turns to colouless.
FeSO4.7H2O--------->FeSO4+7H2O

Answer 2

Solution:

Observations :

Change in color of crystals from green to brown. This is because of the ferrous sulfate crystals on heating will loose water molecules and turn to white which immediately turns brown due to formation of ferric oxide

Water droplet will be observed on the wall of the boiling tube. Removal of water molecules from the crystals will get condensed on the walls of boiling tube.

Chemical reaction:

[tex]FeSO_4.7H_2O\overset{\Delta }{\rightarrow} FeSO_4+7H_2O [/tex]

$2FeSO_4(s)\overset{\Delta }{\rightarrow} Fe_2O_3(s)+SO_2(g)+SO_3(g)$

Decomposition reaction is taking place as as ferrous sulfate crystals are breaking down into smaller compounds that are ferric oxide, sulfur oxide and sulfur tri-oxide.