Answer :

The purpose of adding dilute (3 m) and not concentrated sulfuric acid to the reaction during work up is to increases the proton source that is produce H⁺ ion.

The sulfuric acid is used in the reaction to produced hydronium ions that donates the H atoms. if we add dilute sulfuric acid it will, provide proton source. if we add concentrated sulfuric acid then it will take part in the reaction rather than producing hydronium ions.

Thus, The purpose of adding dilute (3 m) and not concentrated sulfuric acid to the reaction during work up is to increases the proton source that is produce H⁺ ion.

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