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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 `Na_2HPO_(4)`(aq.) is calculated by:

A

`[H^(+)]_("total")~~[H^(+)]` from first step of ionization of acid `H_(2)A`

B

Concentration of `OH^(-)` in solution is `10^(-3)` M

C

The value of `K_(a_1)` is nearly `10^(-5)`

D

`pK_(a_2)-pK_(a_1)=9`

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