(Answered) Hre are two standard reduction potentialshco2-nbsp 2 h2o

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Here are two standard reduction potentials:

HCO₂^- + 2 H₂O + 2 e^- → HCHO + 3 OH^-E°= -1.07

HCO₂H + 2 H₃O⁺ + 2 e^- → HCHO + 3 H₂OE°= -0.01

If these data are sufficient to allow calculation of K_a for HCO₂H at 298 K do the calculation.
If not, choose additional data you would need to do the calculation:

There is no need of additional data.
ΔS°_f of all reactants.
Value of system.
ΔG°_f of all reactants.
ΔH°_f of all reactants.

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