Scandium(III) hydroxide

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Scandium hydroxide
IUPAC name
Scandium(III) hydroxide
3D model (JSmol)
ECHA InfoCard 100.037.855 Edit this at Wikidata
EC Number
  • 241-658-0
  • InChI=1S/3H2O.Sc/h3*1H2;/q;;;+3/p-3
  • [Sc+3].[OH-].[OH-].[OH-]
Molar mass 95.98 g/mol
Density 2.65 g·cm−3
0.268 g/100 mL
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).

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)1.75Cl1.25, Sc(OH)2NO3 and Sc(OH)2.32(SO4)0.34.[5]


  1. ^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–189. ISBN 1138561630.
  2. ^ Moeller, Therald.; Kremers, Howard E. (1945). "The Basicity Characteristics of Scandium, Yttrium, and the Rare Earth Elements". Chemical Reviews. 37 (1): 97–159. doi:10.1021/cr60116a003. ISSN 0009-2665.
  3. ^ Orlov, Yu. F.; Maslov, E. I.; Belkina, E. I. (2013). "Solubilities of metal hydroxides". Russian Journal of Inorganic Chemistry. 58 (11): 1306–1314. doi:10.1134/S0036023613110168. ISSN 0036-0236. S2CID 96558802.
  4. ^ Vickery, R. C. (1955). "Scandium hydroxide and scandate ions". Journal of the Chemical Society (Resumed): 251. doi:10.1039/jr9550000251. ISSN 0368-1769.
  5. ^ Mironov, N. N.; Mal'kevich, N. V. Scandium hydroxide formation reaction. Zhurnal Neorganicheskoi Khimii, 1970. 15 (3): 599-601.