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For the Nernst equation I've seen both ln and log used applied to Q and I'm confused as to which is correct or if they are used in different situations. Khan academy videos on Youtube seem to strictly use log but in lecture and discussion we've used ln.
Strictly speaking, you can use either as long as you are able to calculate the Q for the reaction. It is often more convenient to use log for problems involving pH because pH = -log[H+]. Do note that that you must multiply the logarithmic term by a factor of 1/log(e) = ~2.303 when you use the log equation instead of the regular ln equation.
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