Standard reaction potentials

Question

 Use the table of Standard Reduction Potentials to calculate the E0cell for a cell made from iodine and bromine.

Answer 1

Using a table of standard reduction potentials, I find the following:

I₂ + 2e- ==> 2I^- Eº = 0.53 V

Br2 + 2e- == 2Br^- Eº = 1.07 V

According to these values, Br2 will be reduced more readily than I2, and so it becomes the cathode. The anode will thus be I2.

Eº_cell = Eº_cathode - Eº_anode

Eº_cell = 1.07 - 0.53

Eª_cell = 0.54 V