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H(3)A is a weak triprotic acid (K(a(1))=...

`H_(3)A` is a weak triprotic acid `(K_(a_(1))=10^(-5),K_(a_(2))=10^(-9),K_(a_(3))=10^(-13))`. What is the value of `(pX)/(10)` of 0.1 M `H_(3)A` (aq) solution? Where pX =- logX and X = `([A^(3-)])/([HA^(2-)])`

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The correct Answer is:
4
`-DeltaH_(f)=129.13(Deltax)^(2)`
`516.52 = 129.13 (Deltax)^(2)`
`(Deltax)^(2)=4`
`Delta_(x)=2=|x_(A)-x_(B)|`
Given `x_(H) = 2`
Hence E. N. of X is = 4
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