Properties: Oxalic Acid is white crystal. Its melting point is 101-102 °C and sublimes at 157 °C.It is soluble in water,alcohol and ethyl ether. It is insoluble in benzene and chloroform. It is toxic. Pharmaceutical industry: for ring elements. Oxytetracycline. Borneol etc.; Application: 1.Purifying agent in pharmaceutical industry, special in antibiotic medication, such as oxytetracycline,Chloramphenicol etc. 2.Precipitating agent in Rare-earth mineral processing. 3.Bleaching agent in the textile activities, wood pulp bleaching. 4.Rust-remover for metal treatment. 5.Grinding agent, such as marble polishing. 6.Waste water treatment, removing calcium from water.