Nernst equation usage

[JennyCKim1J]

Is Nernst equation simply used to find cell potential under non-standard conditions (not 1M)? I'm confused b/c there are different Nernst equations and I think one of them's supposed to be use to calculate k for redox reactions at equilibrium.

[Daniisaacson2F]

Yes, you use it under nonstandard conditions, such as a change in the molarities (not 1M like you said), a different temperature, pressure, etc.

[Sarkis Sislyan 1D]

The Nernst equation is used when finding the E under non-standard conditions. There are multiple versions of the equation, but they all mean the same thing and can be used interchangeably. I believe the equation you are talking about is E°=(RTlnK)/nF, which is pretty much the same thing again. This one can be derived by combining (delta)G°=-nfE° and (delta)G°=-RTlnK into nfE°=RTlnK and separating E°.

[Elizabeth Bamishaye 2I]

The Nernst equation is used when finding the E under non-standard conditions. There are multiple versions of the equation, but they all mean the same thing and can be used interchangeably. I believe the equation you are talking about is E°=(RTlnK)/nF, which is pretty much the same thing again. This one can be derived by combining (delta)G°=-nfE° and (delta)G°=-RTlnK into nfE°=RTlnK and separating E°.

I agree with this explanation!