### Winter 2013 Midterm #7: Which Nernst Equation to Use?

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**Tue Feb 14, 2017 3:41 pm**#7 of the Winter 2013 practice midterm uses the Nernst equation E = E˚ - logQ to solve for K. Why isn't the other equation E = E˚ - lnQ used? When I used the second equation, the answer wasn't the same as when I used the first. How do you know when to use which equation?

Thanks!

Thanks!