Ah, standard electrode potentials se EMF nikalna? Don't forget the anode's potential is always *subtracted* from the cathode's, so EMF = E°(cathode) - E°(anode). The sign... just remember the anode is where oxidation happens, so it's the *more negative* potential in that table.
But in my shed, checking my old battery for electroplating small brass pieces, I saw the opposite once! The copper anode was *less* negative than my theory said, because my solution wasn't pure—sahi hai, real life is messy like my workshop floor.
#exams#study
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