CuSO4 (aq) + Zn (s) → Cu (s) + ZnSO4 (aq) is an example of displacement reaction.
- A displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound.
- In the above reaction, Zn is added to the solution of copper sulphate and Zn displaces Cu from its salt solution. This is because zinc is a more reactive metal that displaces less reactive metal from its solution.
This is indicated by a colour change from blue to colourless.
CuSO4 solution has a blue colour while ZnSO4 solution is colourless.
The structure of copper sulfate is