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Old Sep 3rd 2019, 03:35 PM   #1
Dolphinsea14
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Do following half-reactions have electrode potential that depends on pH?

Do following half-reactions have electrode potential that depends on pH? I know H+ or OH- ions wouldn't be included in Nernst equation for these, but would pH affect chemical balance in these reactions, and therefore electrode potentials?

Br2+2e- -> 2Br-

Cl2+2e- -> 2Cl-

I2+2e- -> 2I-

S2O8+2e- -> 2SO42-?
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Old Sep 10th 2019, 05:53 PM   #2
chemtopper
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Originally Posted by Dolphinsea14 View Post
Do following half-reactions have electrode potential that depends on pH? I know H+ or OH- ions wouldn't be included in Nernst equation for these, but would pH affect chemical balance in these reactions, and therefore electrode potentials?

Br2+2e- -> 2Br-

Cl2+2e- -> 2Cl-

I2+2e- -> 2I-

S2O8+2e- -> 2SO42-?
If H+ and OH- are appearing in net balanced equation then they become the part of Nenst equation which makes it pH dependent which is not case the here
So in all cases in balanced half reactions we do not have H+ or OH- ions
so it is not pH dependent
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