The standard reduction potential of Cu++/Cu is higher than that of Zn++/Zn. Therefore, copper will be deposited at the cathode by accepting two electrons from Zn, while the later will pass into solution as Zn++ ion. Solution The standard reduction potential of Cu++/Cu is higher than that of Zn++/Zn. Therefore, copper will be deposited at the cathode by accepting two electrons from Zn, while the later will pass into solution as Zn++ ion..