Calculate the change in \( \mathrm{pH} \) of \( 0.1 \mathrm{M} \mat...

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Calculate the change in \( \mathrm{pH} \) of \( 0.1 \mathrm{M} \mathrm{Na} 2 \mathrm{HA} \) solution after diluting it to ten times the original volume.
\[
\text { (Given that for } \mathrm{H}_{3} \mathrm{~A}: \mathrm{K}_{\mathrm{a}_{1}}=10^{-4}, \mathrm{~K}_{\mathrm{a}_{2}}=10^{-7}, \mathrm{~K}_{\mathrm{a}_{3}}=10^{-11} \text { ) }
\]
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