That makes sense to me, but why is it still zero always, even when the concentrations are different on either side so that the e- will flow? Thank you for the explanation! I am slightly confused why we assume the E naught of concentration cells is *always* zero because I thought we just established that it is zero when the concentration of the species is equal on both sides. Just make sure to remember that E naught of concentration cells is always zero. Nhi Pham 3D wrote:Galvanic cells are used when the species are different and concentration cells are used when the species are the same (but concentration of the species on both sides is changed). I assume then that galvanic cells are used more often? Thanks for explaining the difference here. Galvanic cells work because there is usually a species on the cathode side that have a higher positive potential that pulls electrons over to that side, allowing it to be reduced and the species on the anode side to be oxidized. I liked how Lavelle described galvanic cells as batteries (something that can change chemical energy into electrical energy). Galvanic cells are used when the species are different and concentration cells are used when the species are the same (but concentration of the species on both sides is changed). In order to allow for electrons to flow, the concentration of the species on the cathode side has to be increased so that it has sufficient pulling power to allow the redox reaction to occur. If there is the same amount of each species on both sides, electrons will not flow and therefore E naught of concentration cells is always zero. Galvanic cells work because there is usually a species on the cathode side that has a higher positive potential that pulls electrons over to that side, allowing it to be reduced and the species on the anode side to be oxidized.Ĭoncentration cells are a kind of galvanic cell, but the main difference is that the species on both sides (anode and cathode) are the same.
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