A standard galvanic cell is constructed with Pb2+ | Pb and Zn2+ | Zn half cell c

Question

A standard galvanic cell is constructed with Pb2+ | Pb and Zn2+ | Zn half cell compartments connected by a salt bridge. Which of the following statements are correct? Hint: Refer to a table of standard reduction potentials. (Choose all that apply.)

Zn is oxidized at the anode. As the cell runs, anions will migrate from the Pb2+|Pb compartment to the Zn2+|Zn compartment. Zn2+ is reduced at the cathode. The anode compartment is the Zn2+|Zn compartment. In the external circuit, electrons flow from the Pb2+|Pb compartment to the Zn2+|Zn compartment.

Explanation / Answer

Pb2+ | Pb and Zn2+ | Zn half cell

The reduction potential of Pb2+ is -0.13V and the reduction potential of Zn2+ is -0.76 V. Hence oxidation occurs at Zn2+ | Zn half cell and reduction occurs at Pb2+ | Pb half cell

The cell can be represented as Zn|Zn2+|| Pb2+|Pb

Zn is oxidized at the anode and Pb is reduced at cathode.

ZnZn2+ +2e-

Pb2+ + 2e-Pb

As a result concentration of Zn2+ increases near anode and anions will migrate from the Pb2+|Pb compartment to the Zn2+|Zn compartment.

Electrons flow from anode to cathode (ie from Zn compartment to Pb compartment)

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