Electrolysis of copper (II) sulphate using carbon electrode. The bulb is lighted indicates that copper (II) sulphate is an electrolyte which can conduct electricity. Carbon electrode is inert which does not react with electrolyte or product of electrolysis.
At anode : Hydroxide ions ions are selectively
discharged. Gas bubbles are formed which lighted up a glowing wooden splinter. This gas is oxygen.
At cathode : Copper ions are selectively discharged. Shiny brown metal deposited around cathode. This metal is copper.
Electrolysis copper (II) sulphate solution with copper electrodes