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  • Hydroxides
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    Cobalt(III) hydroxide

    From Wikipedia - Reading time: 5 min
    Cobalt(III) hydroxide
    Names
    IUPAC name
    Cobalt(III) hydroxide
    Other names
    Cobaltic hydroxide
    Identifiers
    CAS Number
    3D model (JSmol)
    ChemSpider
    ECHA InfoCard 100.013.776 Edit this at Wikidata
    EC Number
    • 215-153-0
    PubChem CID
    UNII
    CompTox Dashboard (EPA)
    InChI
    • InChI=1S/Co.3H2O/h;3*1H2/q+3;;;/p-3 checkY[pubchem]
      Key: FXVNMSSSMOVRTC-UHFFFAOYSA-K checkY[pubchem]
    SMILES
    • [OH-].[OH-].[OH-].[Co+3]
    Properties
    Chemical formula
    		 Co(OH)3
    Molar mass 109.95522 g
    Appearance brown-black or dark green powder
    Hazards
    GHS labelling:
    Pictograms
    		 GHS07: Exclamation markGHS08: Health hazard
    Signal word
    		 Danger
    Hazard statements
    		 H319, H334, H413
    Precautionary statements
    		 P261, P264, P273, P280, P285, P304+P341, P305+P351+P338, P337+P313, P342+P311, P501
    Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
    Infobox references

    Cobalt(III) hydroxide or cobaltic hydroxide is a chemical compound with formula Co(OH)
    3     or H
    3    CoO
    3    . It is an ionic compound, with trivalent cobalt cations Co3+
     and hydroxyl anions OH−
    .

    The compound is known in two structurally different forms, "brownish-black" and "green". The brownish-black form is a stable solid and can be prepared by reaction of water solutions of cobalt(II) chloride and sodium hydroxide, followed by oxidation with ozone.[1]

    The green form, formerly thought to be cobalt(II) peroxide, apparently requires carbon dioxide as a catalyst. It can be prepared by adding hydrogen peroxide to a solution of cobalt(II) chloride in 96% ethanol at –30 to –35°C, then adding a 15% solution of sodium carbonate in water with intense stirring. The resulting dark green powder is fairly stable at liquid nitrogen temperature, but at room temperature it turns dark brown within a few days.[2]

    Natural occurrence[edit]

    As of 2020, Cobalt(III) hydroxide is unknown among the known mineral species. However, heterogenite, CoO(OH), is known.[3][4]

    See also[edit]

    • Cobalt(II) hydroxide Co(OH)
      2
    • Cobalt(III) oxyhydroxide CoO(OH)

    References[edit]

    1. ^ Pankratov, D.A., Veligzhanin, A.A., and Zubavichus, Y.V. (2013): "Structural Features of Green Cobalt(III) Hydroxide". Russian Journal of Inorganic Chemistry, volume 58, issue 1, pages 67–73. doi:10.1134/S0036023613010142
    2. ^ Pankratov, D.A., Portachenko, T.A., and Perfil’ev, Y.D. (2008): "Emission Mössbauer Study of 'Cobalt Peroxide'". Moscow University Chemical Bulletin, volume 63, issue 5, pages 292–296. doi:10.3103/S002713140805012X
    3. ^ "Heterogenite".
    4. ^ "List of Minerals". 21 March 2011.
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