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H(3)A is a weak triprotic acid (K(a1)=10...

`H_(3)A` is a weak triprotic acid `(K_(a1)=10^(-5),K_(a2)=10^(-9),K_(a3)=10^(-13)`
What is the value of pX of 0.1 M `H_(3)A` (aq.) solution ? Where pX=-log X and X=`[[A^(3-)]]/[[HA^(2-)]]`

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