Cell potential and Gibbs free energy

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Deepika Pugalenthi 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Cell potential and Gibbs free energy

Postby Deepika Pugalenthi 1A » Fri Feb 22, 2019 12:13 pm

When the reaction is spontaneous, why does cell potential have to be positive?

Swetha Ampabathina1I
Posts: 64
Joined: Fri Sep 28, 2018 12:18 am

Re: Cell potential and Gibbs free energy

Postby Swetha Ampabathina1I » Fri Feb 22, 2019 12:21 pm

Cell potential has to be positive in order for the reaction to be spontaneous because in the equation deltaG = -nFEcell, in order for delta G to be spontaneous (negative), Ecell must be positive.

Gary Qiao 1D
Posts: 66
Joined: Fri Sep 28, 2018 12:26 am

Re: Cell potential and Gibbs free energy

Postby Gary Qiao 1D » Fri Feb 22, 2019 12:21 pm

That is because in the equation ΔG = - nFE, a positive cell potential is associated with a negative Gibbs free energy, which means a reaction is spontaneous. A negative cell potential would make the Gibbs free energy positive, meaning that the reaction is no longer spontaneous.


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