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Calculate the changes in pH of 0.1MNaHA ...

Calculate the changes in `pH` of `0.1MNaHA` solution after diluting it to ten times the original volume.(Given that for `H_(3)A:K_(a_(1))=10^(-4),K_(a_(2))=10^(-7),K_(a_(3))=10^(-11))`

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`pH` of solution of amphiprotic species is independent of concenration of solution.
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