Question

The standard reduction potentials of two half cells are;
Ag⁺_(aq) + e⁻  →  Ag_(s) ; E^θ =+0.80v

Mg²⁺_(aq) + 2e⁻   → Mg_(s) E^θ = −2.37

1. Draw a well labelled diagram of an electrochemical cell that can be constructed using the two half cells.
2. Determine the e.m.f of the above cell.

Answer 1

1. 
   
2. e.m.f = E^θred −  E^θoxide
           =+0.80 −(−2.37)
           =+3.17v