Article · Wikipedia archive · Last revised Jun 18, 2026

Gallium(III) hydroxide

Gallium hydroxide is an inorganic compound with the chemical formula Ga(OH)3. It is formed as a gel following the addition of ammonia to Ga3+ salts. It is also found in nature as the rare mineral söhngeite which is reported to contain octahedrally coordinated gallium atoms. Gallium hydroxide is amphoteric. In strongly acidic conditions, the gallium ion, Ga3+ is formed. In strongly basic conditions, [Ga(OH)4]− (tetrahydroxogallate(III)) is formed. Salts of [Ga(OH)4]− are sometimes called gallates.

Last revised
Jun 18, 2026
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Source
Gallium(III) hydroxide
Gallium(III) hydroxide
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Names
IUPAC name
Gallium(III) hydroxide
Systematic IUPAC name
Trihydroxidogallium
Other names
Gallium trihydroxide
Orthogallic acid
Inorganic gallic acid
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.521
UNII
  • InChI=1S/Ga.3H2O/h;3*1H2/q+3;;;/p-3 checkY
    Key: DNUARHPNFXVKEI-UHFFFAOYSA-K checkY
  • InChI=1/Ga.3H2O/h;3*1H2/q+3;;;/p-3
    Key: DNUARHPNFXVKEI-DFZHHIFOAG
  • [Ga+3].[OH-].[OH-].[OH-]
Properties
Ga(OH)3
Molar mass 123.768 g·mol−1
7.28×10−361
Related compounds
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Gallium hydroxide is an inorganic compound with the chemical formula Ga(OH)3. It is formed as a gel following the addition of ammonia to Ga3+ salts.2 It is also found in nature as the rare mineral söhngeite which is reported to contain octahedrally coordinated gallium atoms.3 Gallium hydroxide is amphoteric. In strongly acidic conditions, the gallium ion, Ga3+ is formed. In strongly basic conditions, [Ga(OH)4] (tetrahydroxogallate(III)) is formed. Salts of [Ga(OH)4] are sometimes called gallates.2

References

References

  1. John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
  2. Anthony John Downs, (1993), Chemistry of Aluminium, Gallium, Indium, and Thallium, Springer, ISBN 978-0-7514-0103-5
  3. Crystal Structure of a new mineral söhngeite, J.D. Scott, The American Mineralogist, (1971), 56, 355