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The standard potential of the cell Pb(s) | PbSO4(s) | SO4^2-(aq) || Pb^2+(aq) | Pb(s) is 0.23 V at 25 degrees C. Calculate the equilibrium constant for the reaction of 1 M Pb^2+(aq) with 1 M SO4^2-(aq) 1. 3.7 x 10^16 2. 1.7 x 10^-8 3. 7.7 x 10^3 4. 8.0 x 10^17 5. 6.0 x 10^7