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what is the purpose of acetic acid in the luminol synthesis reaction?

what is the purpose of acetic acid in the luminol synthesis reaction?

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Answer #1

The acetic acid is added to quench the dithionite reaction. The acid's purpose is to decompose any dithionite remaining. Also, treatment with an aqueous acid would take longer for the dithionite to decompose because of the complex equilibria present from the reaction of dithionite with water.

In glacial acetic acid (more or less anhydrous), because there are no side reactions to compete with the decomposition reaction, the decomposition reaction would go to completion rapidly.

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