\( \mathrm{H}_{3} \mathrm{~A} \) is a weak triprotic acid \( \left(\mathrm{K}_{\mathrm{a}_{1}}=1...

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\( \mathrm{H}_{3} \mathrm{~A} \) is a weak triprotic acid \( \left(\mathrm{K}_{\mathrm{a}_{1}}=10^{-5}, \mathrm{~K}_{\mathrm{a}_{2}}=10^{-9}, \mathrm{~K}_{\mathrm{a}_{3}}=10^{-13}\right) \).
\( P \)
Calculate the value of \( \mathrm{pX} \) of \( 0.1 \mathrm{M} \mathrm{H}_{3} \mathrm{~A}(\mathrm{aq}) \) solution where \( \mathrm{pX}=-\log \mathrm{X} \& \mathrm{X}=\frac{\left[\mathrm{A}^{3-}\right]}{\left[\mathrm{HA}^{2-}\right]} \).
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