In the titration of a solution of a weak acid \( \mathrm{HX} \) with \( \mathrm{NaOH} \), the \(...

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In the titration of a solution of a weak acid \( \mathrm{HX} \) with \( \mathrm{NaOH} \), the \( \mathrm{pH} \) is \( 5.8 \) after \( 10.0 \mathrm{~mL} \) of \( \mathrm{NaOH} \) solution has been added and \( 6.402 \) after \( 20.0 \mathrm{~mL} \) of \( \mathrm{NaOH} \) has been added. What is the ionization constant of HX ?
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