Question

During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon as anode: 

(i) What do you observe at the cathode and at the anode?  

(ii) What change is noticed in the electrolyte?  

(iii) Write the reactions at the cathode and at the anode.

Answer 1

(i) Red metal copper deposits at cathode and colourless odourless gas oxygen at Anode. 

(ii) The blue colour of copper sulphate solution soon fades.

(iii) At Cathode: Cu⁺⁺ + 2e^- ⟶ Cu

      At Anode : OH - e^- ⟶ OH

                        4 [OH]⟶ 2H₂O + O₂ ↑

Comments

In (I)pink bluish copper metal will deposit