Problem: Using standard electrode potentials calculate ΔG˚rxn and use its value to estimate the equilibrium constant for each of the reactions at 25 ˚C^circ { m{C}}.Pb2+(aq) + Mg(s) → Pb(s) + Mg2+(aq)

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Step 1


Pb2+ (aq)  Pb (s)

change in O.S. = 2 to 0

decrease/gain electrons  reduction  cathode


Mg (s)  Mg2+ (aq)

change in O.S. = 0 to 2

increase/ lose electrons  oxidation  anode


E°cell = E°cathode - E°anodeE°cell =(-0.13 V)- (-2.37 V)

cell = 2.24 V


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Problem Details

Using standard electrode potentials calculate ΔG˚rxn and use its value to estimate the equilibrium constant for each of the reactions at 25 ˚C.

Pb2+(aq) + Mg(s) → Pb(s) + Mg2+(aq)

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