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Citric acid (CA), also known as citrate, has the molecular formula C₆H₈O₇. It is an important organic acid that appears as colorless crystals, is odorless, and has a strong acidic taste. It is readily soluble in water and serves as a natural preservative and food additive.
Maleic anhydride, also known as maleic acid anhydride (MAH) or simply maleic anhydride, is the anhydride of maleic acid. At room temperature, it exists as a colorless or white solid with a pungent acidic odor, with the molecular formula C4H2O3.
Phthalic anhydride is an organic compound with the molecular formula C8H4O3; it is a cyclic acid anhydride formed by intramolecular dehydration of phthalic acid. Phthalic anhydride is a white solid and serves as an important raw material in the chemical industry, particularly in the production of plasticizers.
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