Negative E

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sarathornburgh1b
Posts: 13
Joined: Wed Sep 21, 2016 2:59 pm

Negative E

Postby sarathornburgh1b » Fri Mar 17, 2017 1:52 pm

How can you tell apart the anode and the cathode when Ecell turns out to be negative? This occurs in 14.31 and other questions, so is there a different way to pick the anode and cathode other than choosing them to have a positive Ecell result?

Dianna Grigorian 1C
Posts: 72
Joined: Wed Sep 21, 2016 2:55 pm

Re: Negative E

Postby Dianna Grigorian 1C » Fri Mar 17, 2017 1:56 pm

I think that we primarily distinguish between the anode and cathode by the sign of the E value so whether it will be positive or negative in order to provide a favorable E. However, when some problems give the chemical equation and we need to write the half reactions, we need to be consistent with this so even though it might give us a negative value, it is the way we should write the oxidation and reduction reactions


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