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  • Oxalic acid is an organic compound with the formula H₂C₂O₄. It is a colorless crystalline solid that, when dissolved in water, forms a colorless solution. It is classified as a dicarboxylic acid. In terms of acid strength, it is much stronger than acetic acid. Oxalic acid is a reducing agent and its conjugate base, known as oxalate, is a chelating agent for metal cations. Typically, oxalic acid occurs as the dihydrate with the formula H₂C₂O₄·2H₂O. Oral consumption of oxalic acid in excess or prolonged skin contact can be dangerous.

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