[DUDE778]

 Ce4+ + e− --> Ce3+    E° = 1.72 V   
 Fe3+ + e− -> Fe2+    E° = 0.771 V   

What volume of 0.76 M Ce4+ solution must be mixed with 32 mL of 0.30 M Fe2+ solution to produce a solution which produces a platinum electrode potential (relative to SHE) of 1.2455 V.

Am i using the nernst equation?  If so, how would i got around doing it.  If not, then what am i doing :S

[Borek]

Nernst equation will give you ratio of Ce⁴⁺/Ce³⁺ (or Fe³⁺/Fe²⁺), then it is simple stoichiometry.