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Thorium(IV) hydroxide
Names
	IUPAC name Thorium(IV) hydroxide
Identifiers
CAS Number	13825-36-0 [PubChem];
3D model (JSmol)	Interactive image;
ChemSpider	145873 ;
ECHA InfoCard	100.034.097
EC Number	237-522-5;
PubChem CID	166732;
CompTox Dashboard (EPA)	DTXSID70925731 ;
	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
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

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

Production

Thorium(IV) hydroxide can be produced by reacting sodium hydroxide and soluble thorium salts.^[1]

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

Thorium(IV) hydroxide will break up at high temperature and produce thorium dioxide:

Th(OH)₄ → ThO₂ + 2 H₂O

At high pressure, thorium(IV) hydroxide reacts with carbon dioxide, and produce thorium carbonate hemihydrate.^[2]

^ ^a ^b ^c 《无机化合物制备手册》.朱文祥主编.化学工业出版社. P₁₄₃. 【III-251】氢氧化钍（thorium hydroxide）
^ H. Ehrhardt, H. Seidel, H. Schweer (March 1980). "Hochdrucksynthesen einiger Carbonate mit überkritischem CO₂". Zeitschrift für anorganische und allgemeine Chemie (in German). 462 (1): 185–198. doi:10.1002/zaac.19804620121. ISSN 0044-2313. Retrieved 2019-11-23.{{cite journal}}: CS1 maint: multiple names: authors list (link)