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In concentrations cells, the two electrodes are the same except for their concentrations. Because the molecules are the same, the reactions on either side are the reverse reaction of the other, so Ecell will always be 0 because Ecathode and Eanode cancel out. So in the equation , you just have to find n, the number of electrons being transferred, and Q, the concentration of the products over the reactants. Also, to make it easier, T is usually 298.15K, so RT/F = 0.025693
Hope Hyland 2D wrote:How do you know what n is when the half reactions have different numbers of electrons being transferred? Would you balance them and use that number?
Yeah, just find a common multiple for both of them and that's n
For example, if one half reaction is transferring 4 electrons and the other 2, you can multiply the latter reaction by 2 to get 4 electrons being transferred in total. For half reactions transferring 3 and 2 electrons, the total number would be 6 because that is the lowest common multiple of 3 and 2
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