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Understanding the role of potassium carbonate in organic acid purification

The author is puzzled by the use of potassium carbonate in the purification process of 4,4'-((E)-diazene-1,2-diyl)dibenzoic acid. They question why an additional step of dissolving the precipitate in hot potassium carbonate and washing it with acetic acid is necessary, as it seems to add complexity and require an extra acidification step.

Science, Chemistry, Organic Chemistry