Ferric oxalate

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Ferric oxalate
Ferric oxalate.svg
Systematic IUPAC name
iron(3+) ethanedioate (2:3)
Other names
Iron(III) oxalate
3D model (JSmol)
ECHA InfoCard 100.019.047
EC Number 220-951-7
Molar mass 375.747 g/mol
Appearance Pale yellow solid (anhydrous)
Lime green solid (hexahydrate)
Odor odorless
slightly soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Ferric oxalate, also known as iron(III) oxalate, is a chemical compound composed of ferric ions and oxalate ligands; it may also be regarded as the ferric salt of oxalic acid. The anhydrous material is pale yellow; however, it may be hydrated to form Fe2(C2O4)3·6H2O which is bright green in colour

Like many oxalates, ferric oxalate has been investigated as a short term treatment for dentin hypersensitivity.[1] It is used in certain toothpaste formulations; however, its effectiveness has been questioned.[2]

It is used as the light-sensitive element in the Kallitype photographic printing process.

See also[edit]

A number of other iron oxalates are known:-


  1. ^ Gillam, D. G.; Newman, H. N.; Davies, E. H.; Bulman, J. S.; Troullos, E. S.; Curro, F. A. "Clinical evaluation of ferric oxalate in relieving dentine hypersensitivity". Journal of Oral Rehabilitation. 31 (3): 245–250. doi:10.1046/j.0305-182X.2003.01230.x. 
  2. ^ Cunha-Cruz, J.; Stout, J. R.; Heaton, L. J.; Wataha, J. C. (29 December 2010). "Dentin Hypersensitivity and Oxalates: a Systematic Review". Journal of Dental Research. 90 (3): 304–310. doi:10.1177/0022034510389179.