For the half cell reaction
NO2 +2OH ----NO3 +H2O +2e-
E°cell is +0.425.if the overall potential is 0.6250.what is the pH of the solution at:(1) 25°C (2)47°C.if the concentrations of the nitrite ion and nitrate ions are 0.10 and 1.97×10^-10 mol/dm^3 respectively.
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