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Cu(s)
Cu(s)
Ni2+
-0.59 V
Ni(s)
Cu(s)
Cu(s)
Ni2+
Cu(s)
-0.59 V
Ni(s)
-0.59 V
Ni(s)
Ni(s)
Ni2+
soak the copper electrodes in cider vinegar
Copper is a conductive rust-proof metal so it's a non electrolytic metallic conductor.