The pH of the resultant solution of 20 m...

The pH of the resultant solution of 20 mL of 0.1 M `H_(3)PO_(4)` and 20 mL of 0.1 M `Na_(3)PO_(4)` is :

`pK_(a_1)`

`pK_(a_2)`

`(pK_(a_1)+pK_(a_2))/2`

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