Question

Sodium can displace zinc from a solutions of zinc salt. Explain whether the standard reduction potential of sodium is greater or less than that of zinc.​

Answer 1

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In a galvanic cell, current is produced when electrons flow externally through the circuit from the anode to the cathode because of a difference in potential energy between the two electrodes in the electrochemical cell. In the Zn/Cu system, the valence electrons in zinc have a substantially higher potential energy than the valence electrons in copper because of shielding of the s electrons of zinc by the electrons in filled d orbitals. Hence electrons flow spontaneously from zinc to copper(II) ions, forming zinc(II) ions and metallic copper. Just like water flowing spontaneously downhill, which can be made to do work by forcing a waterwheel, the flow of electrons from a higher potential energy to a lower one can also be harnessed to perform work.

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Answer 2

Explanation:

zinc reduction potential is more than sodium, and sodium is act as a reducing agent. so , sodium is oxidised and zinc is reduced.