Cerium(III) hydroxide

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.^[2]

Cerium(III) hydroxide

Names
IUPAC name Cerium(III) hydroxide
Other names Cerium trihydroxide Cerous hydroxide
Identifiers
CAS Number	15785-09-8 Y
3D model (JSmol)	Interactive image
ChemSpider	76758
ECHA InfoCard	100.036.241
EC Number	239-881-3
PubChem CID	85102
CompTox Dashboard (EPA)	DTXSID9065942
InChI InChI=1S/Ce.3H2O/h;3*1H2/q+3;;;/p-3 Key: UNJPQTDTZAKTFK-UHFFFAOYSA-K
SMILES [Ce+3].[OH-].[OH-].[OH-]
Properties
Chemical formula	Ce(OH)3
Molar mass	191.148 g/mol
Appearance	white crystals
Solubility in water	insoluble
Acidity (pKa)	32.8[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Cerium(III) hydroxide is prepared by the reaction of water on cerium metal at 90 °C:

2 Ce + 6 H₂O → 2 Ce(OH)₃↓ + 3 H₂↑