When ferrous sulphate is heated, a colourless gas is liberated and a residue is left in the test tube.
(a) Name the gas and the residue.
(b) Write a balanced chemical equation for the reaction.
Answers
Answer:
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:
FeSO_4.7H_2O\overset{\Delta }{\rightarrow} FeSO_4+7H_2OFeSO
4
.7H
2
O
→
Δ
FeSO
4
+7H
2
O
2FeSO_4(s)\overset{\Delta }{\rightarrow} Fe_2O_3(s)+SO_2(g)+SO_3(g)2FeSO
4
(s)
→
Δ
Fe
2
O
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.
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