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In the titration of a solution of a weak...

In the titration of a solution of a weak acid `HX` with `NaOH`, the `pH` is `5.8` after `10mL` of `NaOH` solution has been added and `6.40` after `20mL` of the `NaOH` has been affed. What is the ionisation constant of the acid `HX`?

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The correct Answer is:
`pK_(a)=6.1`
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