The first part of the question: An alternate model for the reaction of mercury(I) and thallium(III)...

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The first part of the question:

An alternate model for the reaction of mercury(I) and thallium(III) is to have the first step of the mechanism come to a rapid pre-equilibrium. What is the equilibrium constant for this elementary step at 25.0 °C?

E (V) +0.851 2 Hg Hg, (aq) +2e2 Hg 0.7973 T (a)+ 2 e>T(a) 1.252 0.336

I got 6.0 × 10-3 but the answer is 8.6 × 10-3 . How is this so?

The second part of this question:

A concentration cell is set up such that the Hg2+ ion is at unit activity in both compartments initially. To one compartment is added OH to precipitate Hg(OH)2 (Ksp = 1.6x10-22). What will be the cell potential (in volts) at the equivalence point?

The answer I got is -0.645 but the answer is 0.221V. How is this so?

science chemistry

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