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The equivalent point in a titration of 4...

The equivalent point in a titration of `40.0mL` of a sodium of a weak monoprotic acid occurs when `35.0mL` of a `0.10M NaOH` solutio has been added. The `pH` of the solution is 5.5 after the addition of `20.0mL` of `NaOH` solution. What is the dissociation constant of the acid ?

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`2.4 xx 10^(-5)`
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