top score 70

[pistolpete007]

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if the oxidation potential of half rxn is+0.68 what is the reduction potential?

a.-1.38
b.-0.68
c.0
d.1.38

the answer is B
but i thought the reduction potenial is always greater than oxidaton potential?

 

[Simiam]

EMF = E(red) + E(ox)

Since it is a half reaction it will be equal to 0 so it will be the same # but opposite sign..

correct me if I'm wrong, that's just how I understand it.

 

[TarheelKid24]

yea that's right...

the reduction potential is only greater if the species has a greater tendency to be reduced than oxidized...