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The galvanic cell I'm studying has Pb as reducing agent and Cu as oxidizing agent, and as I understand it the reason that the electron flows from the Pb electrode to the Cu electrode without anyone doing anything is because it's thermodynamically favorable, ie a spontaneous reaction. Would this flow of electron still happen if I only have two electrodes only connected by a wire? This doesn't seem possible, but I'm not sure.

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    $\begingroup$ You need some kind of charge neutraliser, i.e. a salt bridge (through which ions can travel in the opposite direction). Otherwise you would end up with a positively and a negatively charged macroscopic area which isn’t possible. $\endgroup$ – Jan Nov 21 '15 at 21:58
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    $\begingroup$ Also you would need an electrolyte for the Pb and Cu electrodes to be immersed in. $\endgroup$ – Nanoputian Nov 21 '15 at 23:02

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