posted by Elleni on .
A Galvanic cell consists of Mg electrode in a 1.0 mol L -1 Mg(NO3)2 solution and a Ag electrode in a 1.0 mol L-1 AgNO3 solution. Calculate standard emf for the spontaneous reaction of this electrochemical cell at 25 C, given that the standard reduction potential Eo for Ag+ is +0.80 V and Eo for Mg2+ is -2.37 V.
Answer is 3.17 V.
I know that Cathode - Annode = Eo cell
How can I find out which is the Cathode and Annode since this is written in a question and not in an equation. The annode is usually on left of equation and cathode on right.
The more positive reduction potential will always be the cathode. That is, Ag+ will be the cathode, and Mg2+ will be the anode.