Why a brown coating is formed on the iron rod when iron rod is kept dipped in copper sulphate solution for sometime? What change will be observed in the colour of the solution
Answers
When a iron rod is kept dipped in copper sulphate solution a brown coating of copper is formed on the surface of iron.
The colour of the solution changes from blue to light green. It shows that iron is more reactive than copper it replaces copper from CuSO4. CuSO4 is blue in colour and FeSO4 is light green in colour.
It is a displacement reaction. The iron on the surface of the rod swaps places with the copper in the solution. So the iron rod gets a copper coating and the blue copper sulphate solution changes to a green ferrous sulphate solution.
when iron rod is kept dipped in copper sulphate solution for sometimes a brown coating is formed on the solution on the iron rod. this happens, according to the reactivity series we know that iron is more reactive than copper so iron displaces copper from copper sulphate and forms iron sulphate. the change in color is that, since the color of copper sulphate is blue. when we put the iron rod in the CuSO4 the blue color changed to green.
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