Redox reactions

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Mya Majewski 1L
Posts: 89
Joined: Fri Sep 25, 2015 3:00 am

Redox reactions

Postby Mya Majewski 1L » Wed Feb 03, 2016 10:06 pm

How do you determine if a redox reaction is favorable?

Tiffany Chen 2E
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: Redox reactions

Postby Tiffany Chen 2E » Thu Feb 04, 2016 1:13 am

Generally, a negative E° means the reaction is unfavorable. This is because in the equation ∆G°(redox)= -nFE°, a negative E° would yield a positive ∆G°. When ∆G° is positive, that means the reaction is not spontaneous and thereby unfavorable.

Jasmeet Dhaliwal 3E
Posts: 33
Joined: Fri Sep 25, 2015 3:00 am

Re: Redox reactions

Postby Jasmeet Dhaliwal 3E » Thu Feb 04, 2016 1:16 am

To determine if a redox reaction is favorable, you must first figure out the E° of the reaction. This is easiest done by splitting the overall reaction into its half-reactions. After determining which half-reaction is the oxidation reaction and which is the reduction reaction, find the respective standard potentials using the table in the book. Then apply the formula, E° = E°(cathode) - E° (anode) to determine the overall E°. If E° is greater than zero, the reaction is spontaneous/favorable (because K>1 and delta G<0). Hope this helps!


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