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 :

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 :
A. `pK_(a_(1)) + "log"2`
B. `pK_(a_(1))`
C. `pK_(a_(2))`
D. `(pK_(a_(1)) + pK_(a_(2)))/(2)`

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 :

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