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Ecell Always Positive

Posted: Sat Mar 16, 2019 5:00 pm
by NatBrown1I
In the textbook it says that Ecell is always positive in a galvanic cell. Why is that?

Re: Ecell Always Positive

Posted: Sat Mar 16, 2019 5:03 pm
by josephperez_2C
We have the equation deltaG = -nFEcell. For galvanic cells, the reaction is spontaneous and therefore Ecell must be positive because deltaG is negative. Not sure if this was a bit roundabout but that's how I think of it.

Re: Ecell Always Positive

Posted: Sat Mar 16, 2019 9:09 pm
by Riley Dean 2D
Is there a case where Ecell could be negative?

Re: Ecell Always Positive

Posted: Sat Mar 16, 2019 9:13 pm
by Danielle Hoekstra 1C
Because the EĀ°cell value of the cathode is positive and anode is negative, the Ecell will be positive as it is equal to the cathode minus the negative anode.