Question

Chemical reaction takes place when iron dust is added into copper sulphate solution but no reaction takes place when copper dust is added into ferrous sulphate solution, why?

Answer 1

Iron is more reactive than copper

Explanation:

Refer to the reactivity serie

Since Iron is more reactive than copper, that means it has a greater tendency to lose electrons and form positive ion, displacing copper ion in copper sulphate solution.

However, since copper is below iron in the reactivity series, it is less reactive than iron and therefore unable to displace the ferrous ion ( Fe2+)

in ferrous sulphate solution.

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Answer 2

Answer:

Explanation:

Zinc dust reacts with copper sulphate solution,

forming zinc sulphate and copper. Zinc displaces

copper from copper sulphate and an aqueous

solution of zinc sulphate is formed.

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) ↓

Zinc Copper

sulphate

Zinc

sulphate

Copper