Question

Why does the colour of copper sulphate solution change when an iron nail is dipped in it ?​

Answer 1

Explanation:

=>When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

Answer 2

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⇨When we dip iron nail in copper sulphate solution the following chemical reaction take place :-

$\begin{gathered} \sf \purple{}\\ \sf \pink{} \\ \\ \sf \green{Fe(s)+CuSo {}^{4}(aq)⇢FeSO {}^{4}(aq) + Cu(s) } \\ \\ \sf \red{ { \bf{}}}\end{gathered}$

More Examples :-

$\begin{gathered} \sf \purple{}\\ \sf \pink{} \\ \\ \sf \purple{Zn(s)+CuSo {}^{4}(aq)⇢ZnSO {}^{4}(aq) + Cu(s) } \\ \\ \sf \red{ { \bf{}}}\end{gathered}$

$\begin{gathered} \sf \pink{}\\ \sf \pink{} \\ \\ \sf \pink{Pb(s)+CuCI {}^{2}(aq)⇢PbCI {}^{2}(aq) + Cu(s) } \\ \\ \sf \red{ { \bf{}}}\end{gathered}$

In this reaction, iron displaced or removed another element copper from copper sulphate solution . This reaction is known as displacement reaction .

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