Question

An excess of liquid mercury is added to an acidified solution of 1.0 × 10^–3 M Fe³⁺. It is found that 5% of Fe³⁺ remains at equilibrium at 25°C. Calculate E°_Hg²⁺/Hg  assuming that the only reaction that occurs is 

2Hg + 2Fe³⁺ → Hg₂²⁺ + 2Fe²⁺ [Given E°_{Fe³⁺/Fe²⁺}= 0.77 V].

Answer 1

E°_Hg²⁺/Hg = 0.792 V