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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
