The electrode where reduction occurs.
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The electrode connected to the positive terminal (anode) typically gets heavier in an electrolytic cell as ions from the electrolyte are attracted to it and deposit on its surface. This process is known as electroplating, where the anode loses mass as it releases ions into the electrolytic solution.
Cu(s)
Cu(s)
In an electrolytic cell with nickel and copper electrodes, nickel at the anode gets oxidized, losing electrons to form nickel ions. The copper electrode at the cathode gains electrons and gets reduced, forming copper metal. This process allows for the transfer of nickel ions from the anode to the cathode.
The cathode
Ni2+