6M.11

[Janelle2E]

Given Co2+/ CO and Ti3+/Ti2+, how do you know which is the cathode or anode and which is the oxidizing/ reducing agent?

[MafruhaR]

To solve for thsi you need to do the following steps according to my understanding:
Identify Oxidation and Reduction Half-Reactions
Compare Standard Reduction Potentials
Identify Reducing and Oxidizing Agents
By doing those three steps you should be able to generate an accurate answer. I hope that helps!!

[405993422]

All you need to do is compare the changes as they advance from reactants to products!

[Lan Wei 3I]

Hi, first you have to look for the standard reduction potential in the appendix that involves Co2+/Co and Ti3+/Ti2+. the standard reduction potential for Co2+/Co is -0.28V, and for Ti3+/Ti2+, it's -0.37. It would be more favorable for the overall E to be positive (spontaneous), so making Ti3+/Ti2+ the anode and Co2+/Co the cathode would yield an overall positive value. Eknot= cathode-anode= -0.28-(-0.37)=0.09V.

[Jennifer Fimbres]

So the anode is the one getting oxidized so it is a reducing agent and the cathode is getting reduced so it is an oxidizing agent. I believe in cases where it could be either way you look at the most electrons passed so in this case the CO2+ to CO is the cathode which is an oxidizing agent being reduced.