anode and cathode

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Kaylee Yan 4C
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

anode and cathode

Postby Kaylee Yan 4C » Sat Feb 06, 2016 11:24 am

given the half reactions from a table of reduction potentials, how do you know which one is the cathode and which one is the anode? if you assume that the e cell will be positive and name the cathode and anode accordingly is it always the case that the e cell would be positive?

Jana Sandhu 3J
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Re: anode and cathode

Postby Jana Sandhu 3J » Sat Feb 06, 2016 2:02 pm

The values stated in the table are reduction potentials, so if you have two different pairs of species and are trying to decide which pair undergoes reduction and which undergoes oxidation, the one with the higher reduction potential is the one more likely to be reduced. Therefore the other species with the lower reduction potential will be oxidized.

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