As an analytical reagent, in dye and paint industries, in polymers, in metal treatment, in cleaning and textile finishing and as a reagent for dehydration and..., as a reducing agent for photographic films and as mordant in the dyeing process. It is used as a plating agent, a surface treating agent, a grinding agent, a precipitating agent in rare-earth mineral processing, a bleaching agent in textile and a purifying agent in the pharmaceutical industry. It plays an important role in antibiotic medication like oxytetracycline and chloramphenicol. It finds application in water treatment plants to remove calcium waste water. It is also used as a buffer in chromatographic separation as well as bleach for wood, removing black stains caused by water penetration.
Oxalic Acid Dihydrate Notes
Hygroscopic. Incompatible with bases, acid chlorides and alkali metals.
Literature References
Stash, A. I.; Chen, Y. S.; Kovalchukova, O. V.; Tsirelson, V. G. Electron density, electrostatic potential, and spatial organization of ammonium hydrooxalate Oxalic Acid Dihydrate heteromolecular crystal from data of diffraction experiment at 15 K using synchrotron radiation and theoretical calculations. Russ. Chem. Bull. 2013, 62 (8), 1752-1763.

Mokhtary, M.; Qandalee, M.; Niaki, M. R. Highly Efficient Selective Oxygenation of Sulfides to Sulfoxides by Oxalic Acid Dihydrate in the Presence of H2O2. J. Chem. 2012, 9 (2), 863-868.