cerium(III) hydroxide
{{ref improve|date=March 2015}}
{{chembox
| verifiedrevid =
| Name = Cerium(III) hydroxide
| ImageFile =
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| IUPACName = Cerium(III) hydroxide
| OtherNames = Cerium trihydroxide
Cerous hydroxide
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref =
| ChemSpiderID = 76758
| PubChem = 85102
| EINECS = 239-881-3
| UNII_Ref =
| UNII =
| InChI =
| SMILES = [Ce+3].[OH-].[OH-].[OH-]
| InChIKey =
| StdInChI_Ref =
| StdInChI = 1S/Ce.3H2O/h;3*1H2/q+3;;;/p-3
| StdInChIKey_Ref =
| StdInChIKey = UNJPQTDTZAKTFK-UHFFFAOYSA-K
| CASNo = 15785-09-8
| CASNo_Ref = {{cascite|correct|CAS}}
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|Section2={{Chembox Properties
| Formula = Ce(OH)3
| MolarMass = 191.148 g/mol
| Appearance = white crystals
| Density =
| Solubility = insoluble
| pKa = 32.8{{cite book|title=Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution|editor-first=D. D.|editor-last=Perrin|edition=2nd|series=IUPAC Chemical Data|issue=29|publisher=Pergamon|location=Oxford|year=1982|publication-date=1984|orig-date=1969|lccn=82-16524|isbn=0-08-029214-3|at=Entry 28}}
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Cerium(III) hydroxide is a hydroxide of the rare-earth metal cerium. It is a pale white powder with the chemical formula Ce(OH)3.[https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?q=all&cid=85102#ec PubChem].
Preparation
Cerium(III) hydroxide is prepared by the reaction of water on cerium metal at 90 °C:
:{{chem2 | 2 Ce + 6 H2O -> 2 Ce(OH)3↓ + 3 H2↑ }}