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Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Answer
Iron is a more reactive metal than copper .
(Since it lies above copper in the reactivity series)
|
K |
|
Na |
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Ba |
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Ca |
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Mg |
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Al |
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Zn |
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Fe |
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Ni |
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Sn |
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Pb |
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H |
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Cu |
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Hg |
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Ag |
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Au |
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Pt |
Copper Sulphate solution is blue .
When a piece of iron nail is placed in Copper Sulphate solution,
Iron Sulphate and Copper is formed as shown below
Fe(s) + CuSO 4 (aq) → FeSO 4 (aq) + Cu(s)
Hence, the colour of the solution turns from blue to transparent , because Fe displaces Cu from CuSO 4 (Copper Sulphate) to form FeSO 4 (Ferrous sulphate) , which is transparent.
