Thorium(IV) hydroxide
{{Disputed|date=September 2024}}
{{Notability|date=September 2024}}
{{chembox
| verifiedrevid =
| Name = Thorium(IV) hydroxide
| ImageFile =Bottles of Thorium Hydroxide.jpg
| ImageName =
| IUPACName = Thorium(IV) hydroxide
| Section1 = {{Chembox Identifiers
| EC_number = 237-522-5
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 145873
| PubChem = 166732
| CASNo = 13825-36-0
| CASNo_Ref = {{cascite|correct|PubChem}}
| StdInChI=1S/4H2O.Th/h4*1H2;/q;;;;+4/p-4
| StdInChIKey = SFKTYEXKZXBQRQ-UHFFFAOYSA-J
| SMILES = [OH-].[OH-].[OH-].[OH-].[Th+4]
}}
| Section2 = {{Chembox Properties
| Formula =Th(OH)4
| MolarMass = 300.07
}}
| Section7 = {{Chembox Hazards
| HPhrases =
| PPhrases =
| GHS_ref =
}}
| Section8 = {{Chembox Related
| OtherAnions = thorium dioxide
thorium nitrate
| OtherCations = cerium(IV) hydroxide
}}
}}
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.《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）
Reactions
New thorium(IV) hydroxide is soluble in acid but its solubility will decrease when older.
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.{{cite journal|journal=Zeitschrift für anorganische und allgemeine Chemie|volume=462|issue=1|language=de|issn=0044-2313|date=March 1980|pages=185–198|doi=10.1002/zaac.19804620121|url=http://doi.wiley.com/10.1002/zaac.19804620121|title=Hochdrucksynthesen einiger Carbonate mit überkritischem CO2|accessdate=2019-11-23|author=H. Ehrhardt, H. Seidel, H. Schweer|url-access=subscription}}