reduction Potential Vs. electromotive force

[Dencology]

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guys,
i don't understand the difference between these two: reduction Potential Vs. electromotive force (Kaplan pg. 959)

for half reaction we try to find out which has been oxidized and which has been reduced. then we just add them together. the most positive is reduced and the most negative is oxidized.

 

[glk2101]

pretty sure this is right:
you have two half reactions..and whichever has a higher, more positive reduction potential will be reduced while the other will be oxidized..so you reverse the reduction potential for the thing that is being oxidized..
then you can add up the two values you have to find the EMF of the cell..if the EMF is positive you have a spontaneous rxn

 

[Dencology]

kaplan pg 959.
so since Rh is oxidized we got to changed the SRP to -0.44V and we add them together.
all right, correct me if i am wrong.
thx

 

[glk2101]

youre correct..since the reaction they show gives you an overall negative EMF, it is not spontaneous and is thus electrolytic