Electrolytic refining of copper equation
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Ni* >99.90 Co <0.065 Cu <0.0008 C <0.0035 Fe <0.0003 S ~0.019 - 0.025 As <0.0015 Pb <0.0003 Zn <0.0002 *Nickel determined by difference. 250 kg drums, 4 drums per pallet 10 kg bags, 5 bags per box, 20 boxes per pallet.
So, zinc can supply electrons to copper, which can supply electrons to silver, but the reverse cannot occur. For zinc to supply electrons, the reaction must be: Zn (s) Zn 2+ (aq) + 2e-For copper to accept electrons, the reaction must be: Cu 2+ (aq) + 2e-Cu (s) The prediction for the overall reaction agrees with the observed changes: Zn (s) + Cu 2+ Zn 2+ + Cu (s)