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 [TiO_x(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 refers to titanium dioxide (TiO₂) as titanic acid,^[2] and the dioxide forms an unstable hydrate when TiCl₄ hydrolyzes.^[3]

• Metatitanic acid (H₂TiO₃),^[4]
• Orthotitanic acid (H₄TiO₄)^[5] or Ti(OH)₄. It is described as a white salt-like powder under "TiO₂·2.16H₂O".^[6]
• 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.^[7]
• Pertitanic acid (H₂TiO₄)^[8]
• Pertitanic acid ([TiO(H₂O₂)]²⁺)^[9]

Orthotitanic acid

Names
IUPAC name Orthotitanic acid
Identifiers
CAS Number	20338-08-3 Y
3D model (JSmol)	Interactive image
ChemSpider	15640680 Y
ECHA InfoCard	100.039.752
EC Number	243-744-3
MeSH	titanium+hydroxide
PubChem CID	88494
UNII	W9EOP89V8G Y
CompTox Dashboard (EPA)	DTXSID30893907
InChI InChI=1S/4H2O.Ti/h4*1H2;/q;;;;+4/p-4 Y Key: LLZRNZOLAXHGLL-UHFFFAOYSA-J Y
SMILES O[Ti](O)(O)O
Properties
Chemical formula	Ti(OH)4
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