Oxalic acid is a white/ colorless, crystalline, water-soluble, poisonous acid, H2C2O4, obtained by reacting carbon monoxide with sodium hydroxide or certain carbohydrates with acids or alkalis. Typically, oxalic acid occurs as the "dihydrate" with the formula C2H2O4·2H2O. Used as a bleaching agent, a cleanser, a reducing agent, a laboratory reagent, a buffer in chromatographic separation, dechelation and deproteinization in tandem with acetonitrile and /or other solvents. Synonyms: Ethanedioic acid dihydrate; Ethanedioic acid; Oxalic Acid 2H2O; CAS No: 6153-56-6; Molecular Formula: H2C2O4 2H2O; Molar Mass:126.07 g/ mol.