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A volume of 50.00 mL of a weak acid of u...

A volume of `50.00 mL` of a weak acid of unknown concentration is titrated with `0.10 M` solution of `NaOH`. The equivalence point is reached after `39.30 mL` of `NaOH` solution has been added. At the half-equivalence point `(19.65 mL)`, the `pH` is `4.85`. Thus, initial concentration of the acid and its `pK_(a)` values are

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