4.0 L of a buffer solution is prepared t...

4.0 L of a buffer solution is prepared that is 1.0 M `NaH_(2)PO_(4)` and 1.0 M `Na_(2)HPO_(4)`. The solution is divided into two halves between two compartments of a cell. Using Pt-electrodes, if current of 1.25 amp. Is passed for 200 minutes, pH of anode compartment is approximately: (Assuming only reaction is electrolysis of water)
(Given : `pKa_(1)pKa_(2)` and `pKa_(3)` of `H_(3)PO_(4)` are 3.07, 8.07, 12.07 and log 1.87 = 0.2648 and log 2.16 = 0.344)

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