Creating Redox Table: Identifying Oxidizing/Reducing Agents

[Alain12345]

I'm working on a chemistry assignment that involves creating redox tables. The explanation in the textbook isn't a very good one and I can't find my answer through google either

Here's the problem:

The following equations represent spontaneous reactions. From this evidence, set up a table of relative strengths of oxidizing and reducing agents. Write half-reaction equations and label the strongest oxidizing agent and reducing agent.

Co_(s) + Pd²⁺_(aq) --->spont. Co²⁺_(aq) + Pd_(s)

Pd_(s) + Pt²⁺ _(aq) --->spont. Pd²⁺_(aq) + Pt_(s)

Mg_(s) + Co²⁺_(aq) ---> spont. Mg²⁺_(aq) + Co_(s)

I know how to make the half reactions and how to identify the oxidizing agent and reducing agent in each reaction, but I'm confused about what to do after that. Thanks.

 

[symbolipoint]

Try to arrange each half reaction into REDUCTION half reactions.
Look then at your first reaction between Co and Pd. Palladium wants to be reduced more than does Cobalt.

Start making a list putting the items that want to be reduced in decreasing "want to be reduced". For the first equation and its half reactions, you would show:

Pd(+2) + 2 e ---> Pd
Co(+2) + 2 e ---> Co

Next, write the half reactions for Pd (which you already did) and of Pt. Now, how does Pt compare in relation to the first two reductions that you wrote for Pd and Co?

Continue this process.

One more thing: Did anyone tell you NOT to check in a table of reduction potentials? When you are done, you should compare your results with the positions of the half reactions in the table of reduction potentials.

 

[symbolipoint]

As of the above, it's been a long time since I last saw that stuff, so someone may need to check what I said more carefully.

 

[sup90]

I am hoping someone can check the explanation above =).. please and thank you!~