Oxalic acid, or H2C2O2, is a highly acidic, organic compound. If it is in its solid form, its molar mass is 90.03 g/mol. Its more-common dihydrous form has a molar mass of 126.07 g/mol.
Oxalic acid occurs naturally in both plants and animals, and in its solid form, it is an odorless, white solid. In modern times, it is produced synthetically using carbon and petroleum products. Oxalic acid has several uses, and it is regularly used as an ingredient in both cleaners and pharmaceuticals. It has a pH of 1.3, so protective gloves, eye gear and clothing must be worn when handling this substance.