Class 12 Chemistry Electrochemistry Electrolysis


Fig. Electrolysis

  • Two copper strips are dipped in an aqueous solution ofcopper sulphate (CuSO4).
  • A DC voltage is applied to both the electrodes.
  • Cu 2+ ions discharge at the cathode

Cu2+(aq) + 2e --> Cu (s)

  • Copper metal is deposited on the cathode and copper is converted into Cu2+ ions at the anode by the following reaction:

Cu --> Cu2+(aq) + 2e

  • The impure copper is the anode that dissolves on passing current whereas the pure copper gets deposited at the cathode. Metals like Na, Mg, Al, etc. are produced using electrochemical reduction of their respective cations.

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