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The set-up below was used to electrolyze aqueous copper (II) sulphate.
a).Explain why the bulb light brightly at the beginning of the experiment and becomes dim after sometime.
b).Write the ionic equation of the reaction that took place at the cathode.

Answer Text:
a).Because concentration of ions is high at the beginning and decreases as the ions are discharged during electrolysis.
b).#CU^(2+) (aq) + 2e → Cu(s)#