Oxalic acid is the chemical compound with the formula that can be written in a number of equivalent ways, C₂O₄H₂, C₂O₂(OH)₂, and as HOOCCOOH. This colourless solid is a dicarboxylic acid. In terms of acid strength, it is about 3,000 times stronger than acetic acid. Its conjugate base, known as oxalate (C₂O₄^2-), is a reducing agent as well as a chelating agent for metal cations. Typically oxalic acid occurs as the dihydrate with the formula C₂O₄H₂·2H₂O. 



USE;

Purifying agent in pharmaceutical industry, such as Oxytetracycline, Chloramphenicol, etc.Precipitating agent in Rare-earth mineral processing; Bleaching agent in the textile activities, wood pulp bleaching; Rust-remover for Metal treatment; Grinding agent, such as Marble polishing; Waste water treatment, removing calcium from water.