Question

why does the blue color of copper sulphate solution change when a piece of iron dropped into it ?

Answer 1

Answer on Question #43196 - Chemistry - Other

Question:

Why does the blue color of copper sulphate solution change when a piece of iron dropped into it?

Answer:

Copper sulphate reacts with more reactive metals than copper (e.g. Mg, Fe, Zn, Al, Sn, Pb, etc.). That is why, when a piece of iron is dropped into the copper sulphate solution, the following chemical reaction occurs:

$$\mathrm{CuSO_4(aq)} + \mathrm{Fe} \rightarrow \mathrm{FeSO_4(aq)} + \mathrm{Cu}$$

As a result the solution color changes from a blue color of $\mathrm{CuSO_4 \cdot 5H_2O}$ to a blue-green color of $\mathrm{FeSO_4 \cdot 7H_2O}$. Additionally, the precipitate of metallic copper is formed on the iron surface.

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