Scandium(III) hydroxide

Scandium(III) hydroxide is an inorganic compound with the chemical formula Sc(OH)₃, the trivalent hydroxide of scandium. It is an amphoteric compound.^[2] It is slightly soluble in water, and its saturated solution (pH = 7.85) contains Sc(OH)₃ and a small amount of Sc(OH)+2. The solubility of scandium(III) hydroxide in water is 0.0279 mol/L. It will convert to ScO(OH) after aging, greatly reducing the solubility (0.0008 mol/L).^[3] Scandium(III) hydroxide can be produced by reacting scandium salts and alkali hydroxides.^[4] In the reaction, different starting ingredients can generate different intermediates such as Sc(OH)_1.75Cl_1.25, Sc(OH)₂NO₃ and Sc(OH)_2.32(SO₄)_0.34.^[5]

Scandium hydroxide

Names
IUPAC name Scandium(III) hydroxide
Identifiers
CAS Number	17674-34-9 Y
3D model (JSmol)	Interactive image
ChemSpider	78687
ECHA InfoCard	100.037.855
EC Number	241-658-0
PubChem CID	87230
CompTox Dashboard (EPA)	DTXSID90938848
InChI InChI=1S/3H2O.Sc/h3*1H2;/q;;;+3/p-3 Key: LQPWUWOODZHKKW-UHFFFAOYSA-K
SMILES [Sc+3].[OH-].[OH-].[OH-]
Properties
Chemical formula	Sc(OH)3
Molar mass	95.977 g·mol−1
Density	2.65 g·cm−3
Solubility in water	0.268 g/(100 mL)
Solubility product (Ksp)	2.22×10−31[1]
Related compounds
Other anions	Scandium chloride Scandium fluoride Scandium nitrate
Other cations	Yttrium(III) hydroxide Lutetium(III) hydroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references