Question

There are two containers in the laboratory. One contains a solution 0.15 M in Fe3+ and 0.45 M in Fe2+, and the other contains a solution that is 0.27 M in I- and 0.05 M in I2. A piece of Platinum is immersed in each container, (a) Calculate the potential of each electrode relative to ENH at 25 °C. (b) Predict the chemical reaction that will occur when these two electrodes are connected and a salt bridge is placed to connect the two containers. 

Answer 1

Oxidation

$2I^-\to\>I_2+2e^-$

Reduction

$2Fe^{3+}+2e^-\to\>2Fe^{2+}$

Overall reaction

$2Fe^{3+}+2I^-\to\>2Fe^{2+}+I_2$