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H(3)PO(4) is a weak triprotic acid, appr...

`H_(3)PO_(4)` is a weak triprotic acid, approximate pH 0.1 M `NaHPO_(4)`(aq.) is calculated by:

A

`1/2[pK_(a1)+pK_(a2)]`

B

`1/2[pK_(a2)+pK_(a3)]`

C

`1/2[pK_(a1)+pK_(a3)]`

D

`pK_(a1)+pK_(2)`

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