Titanic acid

Titanic acid is a general name for a family of chemical compounds of the elements titanium, hydrogen, and oxygen, with the general formula [TiOx(OH)4-2x]n. Various simple titanic acids have been claimed, mainly in the older literature.[1] No crystallographic and little spectroscopic support exists for these materials. Some older literature including Brauer's Handbook refers to TiO2 as titanic acid.[2]

  • Metatitanic acid (H2TiO3),[3]
  • Orthotitanic acid (H4TiO4)[4] or Ti(OH)4. It is described as a white salt-like powder under "TiO2·2.16H2O".[5]
  • Peroxotitanic acid (Ti(OH)3O2H) has also been described as resulting from the treatment of titanium dioxide in sulfuric acid with hydrogen peroxide. The resulting yellow solid decomposes with loss of O2.[6]
  • Pertitanic acid (H2TiO4)
  • Pertitanic acid ([TiO(H2O2)]2+)[7]
Titanic acid
3D model (JSmol)
ECHA InfoCard 100.039.752
EC Number
  • 243-744-3
MeSH titanium+hydroxide
  • InChI=1S/4H2O.Ti/h4*1H2;/q;;;;+4/p-4 Y
  • O[Ti](O)(O)O
Molar mass 115.90 g/mol
Appearance White crystals
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references


  1. Frederick Pearson Treadwell (1916). Qualitative analysis. J.Wiley & sons, Incorporated. p. 538. Retrieved 26 March 2021.
  2. C. Remigius Fresenius (1887). Qualitative Chemical Analysis. J. & A. Churchill. pp. 115–116.
  3. F.P. Dunnington (1891). "On metatitanic acid and the estimation of titanium by hydrogen peroxide". Journal of the American Chemical Society. 13 (7): 210–211. doi:10.1021/ja02124a032.
  4. Leonard Dobbin, Hugh Marshall (1904). Salts and their reactions: A class-book of practical chemistry. University of Edinburgh.
  5. Ehrlich, P. (1963). "Titanium(IV) Oxide Hydrate TiO2·nH2O". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 1 (2nd ed.). New York: Academic Press. p. 1218.
  6. Ehrlich, P. (1963). "Peroxotitanic Acid H4TiO5". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 1 (2nd ed.). New York: Academic Press. p. 1219.
  7. Fukamauchi, Hisao (1967). "Analysis using fluotitanic acid-hydrogen peroxide reagent: A review". Fresenius' Journal of Analytical Chemistry. 229 (6): 413–433. doi:10.1007/BF00505508. S2CID 92389986.

Further reading

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