Oxalic acid main applications include cleaning or bleaching, especially for the removal of rust (iron complexing agent). And also use as general metal and equipment cleaning, purifying agent and intermediate for many compounds.

Technical Bulletin

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Oxalic acid is an organic compound with the formula H2C2O4. This colorless crystalline solid is a dicarboxylic acid. In terms of acid strength, it is about 3,000 times stronger than acetic acid. Oxalic acid is a reducing agent and its conjugate base, known as oxalate (C2O42-), is a chelating agent for metal cations. Typically oxalic acid occurs as the dihydrate with the formula H2C2O4.2H2O.