Question

An electrolytic all is an set up using two platinum electrodes and an aqueous solution of copper (II) sulphate.

(i) Draw a labelled diagram of the electrolytic cell.

(ii) Name the ions present in the cell.

(iii) Name the ions migrating towards the anode.

(iv) Name the ios migrating towards the cathode.

(v) Name the ions which will not be discharged at electrodes during electrolysis.

(vi) Write the reaction at the cathode.

(vii) Write the reaction at the anode.

(viii) Name the spectator ions in the solution.

(ix) Why the electrolytic solution acidified

Answer 1

(ii) The ions present in the cell are Cu²⁺ + H^{+ ,} SO₄^2- and OH^– .

(iii) The ions migrating towards the anode are SO₄^2- and OH^– .

(iv) The ions migrating towards the cathode is Cu²⁺ .

(v) The ions will not be discharged at electrode during electrolysis are H⁺ and OH^–.

(vi) Reaction at cathode :

Cu²⁺  - 2e^-  → Cu

(vii) Reaction at cathode :

4OH^-  - 4e^-  → 4OH

2OH + 2OH  → 2H₂O + O₂

(viii) The separator ions present in the solution are – SO₄ ^2- and OH^– .

(ix) To increase the electrical conductivity of electrolyte.