What happens when ferrous sulphate crystals are heated in a dry boiling tube? Write the chemical equations for the chemical reactions taking place. Also write the number of moles of gaseous products released.
Answers
Decomposition Reaction
Explanation:
When ferrous sulphate is heated in a boiling tube, the ferrous sulphate crystals contain water molecules (FeSO4. 7H2O). On heating, these ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So you can observe that their colour changes from light green to white.
On further heating, the anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3). For observation, you can smell the gas emitted. It smells like burning sulphur.
This is a decomposition reaction in which a single reactant FeSO4 decomposes to form three different products.
2FeSO4 ------heat-------> Fe2O3 +SO2 +SO3
When ferrous sulphate crystals are heated in a dry boiling tube, they undergo decomposition to form Fe2O3 along with the release of SO2 and SO3.
- The chemical reaction is given as follows:
2 FeSO4 (s) + Heat → Fe2O3 (s) + SO2 (g) + SO3 (g)
- There will be 1 mole of SO2 and 1 mole of SO3 formed in this reaction.
- So the total no of moles of gaseous products released is Two (2).