According to the given data:
MnO2 4H 2e = Mn2 2H2O, φ0 = 1.228 V
NO3- 10H 8e = NH4 ZH2O, φ0 = 0.870 V
write the equation of the current-forming reaction in ion-molecular form. Calculate the value of the standard equilibrium constant for this process.

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