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For a solution of weak triprotic acid H(...

For a solution of weak triprotic acid `H_(3)A(K_(a_(1))gtgtK_(a_(2)),K_(a_(3)):K_(a_(2))=10^(-8),K_(a_(3))=10^(-13),[A^(3-)]=10^(-17)M`.Determine `pH` of solutions. Report your answer as `0` if you find data insufficient.

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`{:(,HA^(2-),hArr,H^(+),+,A^(3-),,,K_(a_(3))=10^(-13)),(t=eq,,10^(-8),,,,10^(-17),):}`
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