oksaalihapon
Oksaalihapon, widely known as oxalic acid or ethanedioic acid, is a colorless, crystalline dicarboxylic acid with the formula C2H2O4. It occurs naturally in many plants, including spinach, rhubarb, and notably oxalis (wood sorrel), and is produced on an industrial scale by oxidation of carbohydrates.
In water it dissociates in two steps, forming hydrogen oxalate (HC2O4−) and oxalate (C2O4^2−); typical pKa values
Oksaalihapon forms stable salts with many metal ions (oxalates). Insoluble calcium oxalate can precipitate, a concern
Safety and handling: oxalic acid is caustic and toxic if ingested; contact with skin or eyes can
History: the name derives from Oxalis, the wood sorrel genus in which the compound was first identified.