Why we add sodium sulfite in oxidation of benzaldehyde to benzoic acid?
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My dear friend. Hi, Benzaldehyde is easily oxidized to benzoic acid which can impede its desired reaction and hence it is always recommended to use freshly distilled benzaldehyde. Simple bicarbonate treatment of benzaldehyde should remove all/any benzoic acid present to the feed Benzaldehyde. Keeping Benzaldehyde feed in inert atmosphere (oxygen free) will definitely diminish the formation of benzoic acid. Addition of oxygen scavenger to the feed Benzaldehyde will also help to diminish the formation of benzoic acid.
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