# Nernst equation?

I keep seeing the Nernst equation in two different forms, one using the natural log and the other using log base 10. Could someone explain why there are two different versions, and which should be used? Thank you in advance.

• I see this issue calculating entropy, where the log base is chosen as a matter of convenience. With the Nernst equation, the equations of different base using either log base 10 or log base e are equal when a correction factor of ~2.3026 is applied to the log base 10 equation. Commented Nov 7, 2015 at 17:47
• The factor of ~2.3026 comes from the ratio ln(n) / log10(n) = 2.3026... for any real positive value of n. Commented Nov 7, 2015 at 17:59
• You will see change in constant in that case. As @Galen pointed out, you will get multiplication factor of 2.3026 in log 10 equation. And you can use any. Both are correct. Commented Nov 8, 2015 at 7:30
• Thank you! I completely forgot about change of base when using logarithms.
– Meep
Commented Nov 8, 2015 at 10:01