Thorium(IV) hydroxide

Thorium(IV) hydroxide is an inorganic compound with a chemical formula Th(OH)₄.

Thorium(IV) hydroxide

Names
IUPAC name Thorium(IV) hydroxide
Identifiers
CAS Number	13825-36-0 Y[PubChem]
3D model (JSmol)	Interactive image
ChemSpider	145873 Y
ECHA InfoCard	100.034.097
EC Number	237-522-5
PubChem CID	166732
CompTox Dashboard (EPA)	DTXSID501337265 DTXSID70925731, DTXSID501337265
InChI InChI=1S/4H2O.Th/h4*1H2;/q;;;;+4/p-4 Key: SFKTYEXKZXBQRQ-UHFFFAOYSA-J
SMILES [OH-].[OH-].[OH-].[OH-].[Th+4]
Properties
Chemical formula	Th(OH)4
Molar mass	300.07
Appearance	white solid[1]
Related compounds
Other anions	thorium dioxide thorium nitrate
Other cations	cerium(IV) hydroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Production

Thorium(IV) hydroxide can be produced by reacting alkali metal hydroxides like sodium hydroxide and potassium hydroxide and soluble thorium salts, such as thorium nitrate.^[1][2][3]

Reactions

New thorium(IV) hydroxide is soluble in acid but its solubility will decrease when older.^[1]

At above 470 °C, thorium(IV) hydroxide will continuously decompose and produce thorium dioxide:^[3]

Th(OH)₄ → ThO₂ + 2 H₂O

Thorium(IV) hydroxide reacts with carbon dioxide gas. Under ambient conditions this produces the hydrated oxide carbonate ThOCO₃·xH₂O, and under higher pressure this produces thorium carbonate hemihydrate (Th(CO₃)₂·½H₂O).^[4][3][5]