Nernst equation

[Sagar karan]

There is confusion regarding to this eqn!

As given,

E=E°-RT/nFIn[M]/[Mⁿ+]----that's ok.

But in Daniel cell the Nernst eqn for,

Zn(s)|Zn2+(aq) electrode is

E=E°+RT/2FIn[Zn2+]---- +ve sign has been put and the molar concentration ratio taken [Zn2+]/1.Why&How?

[salahzayed]

Hello sagar.

This so because [Zn] is an element and is not counted in the conc. Eq.

Now the positive sign is due to the reverse of the fraction since [Zn2+] should appear in the numerator.

I hope I made it clear.

Sorry in denominator.