Question regarding: "E° + Value means reduction is spontaneous"

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Suk Jin Song 3L
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Joined: Tue Nov 17, 2015 3:00 am

Question regarding: "E° + Value means reduction is spontaneous"

Postby Suk Jin Song 3L » Mon Jan 30, 2017 7:46 pm

Hello, just a quick question on what "E° + Value means reduction is spontaneous" means. It's on page 46 of the course reader.

What do they mean by "value" and is there a case when E° is not spontaneous?

Thomas_Rodriguez_3G
Posts: 12
Joined: Wed Sep 21, 2016 2:58 pm

Re: Question regarding: "E° + Value means reduction is spontaneous"

Postby Thomas_Rodriguez_3G » Mon Jan 30, 2017 7:50 pm

I think its "E positive value," not E plus value.

Kristen Hazama 1I
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Joined: Wed Nov 18, 2015 3:00 am

Re: Question regarding: "E° + Value means reduction is spontaneous"

Postby Kristen Hazama 1I » Sun Feb 05, 2017 6:08 pm

E° must always be positive or else the reaction will not occur. The value comes from the equation E°cell=E°cathode - E°anode. If E° were negative, the reaction would be non-spontaneous because the work would not be done by the system. On page 49, there is the equation deltaG°=-nFE°. If E°were negative then you would be multiplying a negative by a negative, making deltaG° positive, which means the reaction is non-spontaneous. Therefore, E° must always be positive.

DBaquero
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Re: Question regarding: "E° + Value means reduction is spontaneous"

Postby DBaquero » Sun Feb 05, 2017 6:26 pm

Yeah if E°is negative then it would require outside energy in order for the reaction to occur.


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