nernst equn and electrochemical cells

[Murmur]

Hello!
If you have and cell where both electrodes are Ag(s) and in one half there are 2M Ag+(aq) and on the other, .1M Ag+(aq), what is the cell potential at 298K?

I know
Ecell = Ecell{at STP} - [25.693mV{at 298K}/(mol e-)]Ln(Q)

but my problem is as follows:

Do I use the equation {Ag+(aq) + e- -> Ag(s) + .8V} or its opposite?

[HowardKennitby]

I have no idea what you are asking about but this might help

http://en.wikipedia.org/wiki/Nernst_equation

[Murmur]

thanks- i do have the internet at my disposal already.

[Murmur]

i think cells naturally create positive voltage, in which case Ag+ + e- -> Ag + .8V and E^0 is 1.6?