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Two litre solution of a buffer mixture c...

Two litre solution of a buffer mixture containing `1.0 M NaH_(2)PO_(4)` and `1.0 M Na_(2)HPO_(4)` is placed in two compartments (one litre ineach) of an electrolytic cell. The platinum electrodes are inserted in each compartments and `1.25` ampere current is passed for `212` minute. Assuming electrolysis of water onlu at each compartment. What will be `pH` in each compartment after passage of above charge ? (`pK_(a)` for `H_(2)PO_(4)^(-) = 2.15`.)

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The correct Answer is:
`2.005, 2.295 ;`
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