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The m-CPBA is reduced by the $\ce{S2O4^{2-}}$, but why does it leave the mixture then?

Why does the reduced m-CPBA leave with the oxidised $\ce{S2O4^{2-}}$?

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    $\begingroup$ The pKa of MCPBA is~7.6, the pKa of 3-Cl-benzoic acid is ~3.8 so is much easier to remove by an aq. base wash $\endgroup$
    – Waylander
    Nov 26, 2023 at 10:20

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