2 ways to calculate net standard reduction potential

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Discussion Overview

The discussion revolves around two equations for calculating the standard reduction potential of a cell, exploring the reasons for the existence of two formulas and the conventions behind their use. The context includes theoretical understanding and application in electrochemistry.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant notes two equations for standard reduction potential: Eocell = Eocathode + Eoanode and Eocell = Eocathode - Eoanode, questioning the rationale behind each.
  • Another participant suggests that the difference in equations may relate to European and American conventions, although they express uncertainty about the specifics.
  • A participant inquires whether the first equation corresponds to the American convention, indicating a personal context related to preparing for the SAT.
  • One participant expresses doubt about the correctness of the formulas, suggesting a possible omission of a minus sign in one of them, highlighting concerns about the absolute potential versus convention.
  • Another participant questions if the spontaneity of a reaction can be determined by simply adding the two reduction potentials together.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct application of the equations or the conventions involved, indicating multiple competing views and unresolved questions.

Contextual Notes

There are limitations regarding the clarity of conventions and potential omissions in the formulas discussed, which may affect the understanding of standard reduction potentials.

TT0
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On chemwiki, they gave 2 equations to find the standard reduction potential of a cell:

Eocell = Eocathode + Eoanode

Eocell = Eocathode - Eoanode

Why are there 2 equations and when do you use each one?

Thanks
 
Chemistry news on Phys.org
European convention and American convention and before you ask, "No, I can no longer tell you the differences, nor which is to be preferred."
 
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Is the first one the American convention? (Im taking the SAT)
 
Unless I am missing something I feel like there is a mistake in these formulas. Sign of the overall cell potential can be a matter of convention, but the absolute potential shouldn't be. I wonder if they did not omit a minus sign in one of the formulas.
 
Would calculating spontaneity of reaction be the 2 reduction potentials just added to each other?
 

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