Question

Zinc sulfate forms a colorless solution in water. Will you observe any colour on adding copper turning in it?

Answer 1

Reactivity of Copper and Zinc:

• Copper$\left(\mathrm{Cu}\right)$ has a lower reactivity than zinc$\left(\mathrm{Zn}\right)$.
• As a result, copper does not replace zinc in the zinc sulfate $\left({\mathrm{ZnSO}}_4\right)$ solution.
• So, the reaction will not take place.

Chemical Reaction:

• $$\begin{gathered} {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)\to \mathrm{No}\mathrm{reaction} \\ \mathrm{colourless} \end{gathered}$$

Hence, there will be no color change in the Zinc sulfate solution after adding copper to it.