(a) A voltaic cell was constructed with Mg?" /Mg and Pb/Pb half-cells having standard reduction potential of -2.37 V and -0.13 V respectively. Based on the given information. Write the half-cell reactions for anode and cathode, and write the overall cell reaction (b) What is the cathode half-cell in Daniel cell?, write the cathode reaction (e) The voltmeter reading for the full cell, Pus) Hag), H(aq)|| Ag" (aq)| Agls), was +0.80V. Draw the Helmholtz electrical double layer for Ag /Ag and H/H, half-cells separately. (3+3+4)
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Answer:
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.
Explanation:
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