A standard galvanic cell is constructed with Cu 2+ | Cu and I 2 | I - 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.)
I 2 is reduced at the cathode.
I -
is oxidized at the anode.
The anode compartment is the Cu 2+
|Cu compartment.
In the external circuit, electrons flow from the Cu 2+
|Cu compartment to the I 2 |I -
compartment.
As the cell runs, anions will migrate from the Cu 2+
|Cu compartment to the I 2 |I -
compartment.
Solution
Cu2+ + 2 e? ----> Cu(s) Â Â E0 = +0.337 v
I2(s) + 2 e? ----> 2 I? Â Â E0 = +0.54 v
from the above data, I - electrode acts as cathode
Cu - electrode acts as anode
answer:
I2 is reduced at the cathode.
The anode compartment is the Cu2+|Cu compartment.
In the external circuit, electrons flow from the Cu2+|Cu compartment to the I2|I-
compartment.