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Galvanic Cells

Posted: Mon Feb 08, 2016 1:13 am
by Sumaiyah I 1E
Do Galvanic cells always have positive cell potentials? Why do they do or don't?

Re: Galvanic Cells

Posted: Mon Feb 08, 2016 2:53 pm
by Nicholas Codallos 4C
Ideally they are supposed to be otherwise they wouldn't be galvanic cells since the purpose of a galvanic cell is to generate volts. If the cell potential was negative then it wouldn't be able to generate volts since cell potential represents the spontaneity of a reaction (positive means the reaction is spontaneous.)

Re: Galvanic Cells

Posted: Mon Feb 08, 2016 4:19 pm
by Chem_Mod
Yes because the point of a galvanic cell is to use a spontaneous reaction to produce a current. Otherwise, if it wouldn't be doing useful work if the reaction were non-spontaneous i.e. having a negative potential.