Scandium(III) hydroxide
{{Chembox
| Name = Scandium hydroxide
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| IUPACName = Scandium(III) hydroxide
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| Section1 = {{Chembox Identifiers
| CASNo = 17674-34-9
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| PubChem = 87230
| ChemSpiderID = 78687
| EC_number = 241-658-0
| StdInChI=1S/3H2O.Sc/h3*1H2;/q;;;+3/p-3
| StdInChIKey = LQPWUWOODZHKKW-UHFFFAOYSA-K
| SMILES = [Sc+3].[OH-].[OH-].[OH-] }}
| Section2 = {{Chembox Properties
| Formula = {{chem2|Sc(OH)3}}
| Sc=1|O=3|H=3
| Appearance =
| Density = 2.65 g·cm−3
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| Solubility = 0.268 g/(100 mL)
| SolubilityProduct = 2.22{{e|−31}}{{cite book |author1=John Rumble |title=CRC Handbook of Chemistry and Physics |date=June 18, 2018 |publisher=CRC Press |isbn=978-1138561632 |pages=5–189|edition=99 |language=English}}}}
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| Section9 = {{Chembox Related
| OtherAnions = Scandium chloride
Scandium fluoride
Scandium nitrate
| OtherCations = Yttrium(III) hydroxide
Lutetium(III) hydroxide
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Scandium(III) hydroxide is an inorganic compound with the chemical formula {{chem2|Sc(OH)3}}, the trivalent hydroxide of scandium. It is an amphoteric compound.{{cite journal|last1=Moeller|first1=Therald.|last2=Kremers|first2=Howard E.|title=The Basicity Characteristics of Scandium, Yttrium, and the Rare Earth Elements.|journal=Chemical Reviews|volume=37|issue=1|year=1945|pages=97–159|issn=0009-2665|doi=10.1021/cr60116a003}} It is slightly soluble in water, and its saturated solution (pH = 7.85) contains {{chem2|Sc(OH)3}} and a small amount of {{chem2|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).{{cite journal|last1=Orlov|first1=Yu. F.|last2=Maslov|first2=E. I.|last3=Belkina|first3=E. I.|title=Solubilities of metal hydroxides|journal=Russian Journal of Inorganic Chemistry|volume=58|issue=11|year=2013|pages=1306–1314|issn=0036-0236|doi=10.1134/S0036023613110168|s2cid=96558802}} Scandium(III) hydroxide can be produced by reacting scandium salts and alkali hydroxides.{{cite journal|last1=Vickery|first1=R. C.|title=Scandium hydroxide and scandate ions|journal=Journal of the Chemical Society (Resumed)|year=1955|pages=251|issn=0368-1769|doi=10.1039/jr9550000251}} In the reaction, different starting ingredients can generate different intermediates such as {{chem2|Sc(OH)1.75Cl1.25}}, {{chem2|Sc(OH)2NO3}} and {{chem2|Sc(OH)2.32(SO4)0.34}}.Mironov, N. N.; Mal'kevich, N. V. Scandium hydroxide formation reaction. Zhurnal Neorganicheskoi Khimii, 1970. 15 (3): 599-601.