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Chromium(III) hydroxide

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(Redirected from Chromium hydroxide) Chemical compound (Cr(OH)3)
Chromium(III) hydroxide
Names
IUPAC name Chromium(3+) hydroxide
Systematic IUPAC name Idrossido Cromoso
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.781 Edit this at Wikidata
PubChem CID
RTECS number
  • GB2670000
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Cr.3H2O/h;3*1H2Key: LXMQZGGLHVSEBA-UHFFFAOYSA-N
SMILES
  • ionic form: ...
  • coordination form: O(O)O
Properties
Chemical formula Cr(OH)3
Molar mass 103.02 g/mol
Appearance green, gelatinous precipitate
Density 3.11 g/cm
Solubility in water insoluble
Hazards
NIOSH (US health exposure limits):
PEL (Permissible) TWA 1 mg/m
REL (Recommended) TWA 0.5 mg/m
IDLH (Immediate danger) 250 mg/m
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Chromium(III) hydroxide is a gelatinous green inorganic compound with the chemical formula Cr(OH)3. It is a polymer with an undefined structure and low solubility. It is amphoteric, dissolving in both strong alkalis and strong acids.

In alkali: Cr(OH)3 + OH → CrO−2 + 2 H2O
In acid: Cr(OH)3(OH2)3 + 3 H → Cr(OH2)6

It is used as a pigment, as a mordant, and as a catalyst for organic reactions.

It is manufactured by adding a solution of ammonium hydroxide to a solution of chromium salt.

Pure Cr(OH)3 is as yet (2020) unknown among the mineral species. However, three natural polymorphs of the oxyhydroxide, CrO(OH), are known: bracewellite, grimaldiite and guyanaite.

References

  1. ^ NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).
  2. Rai, Dhanpat; Sass, Bruce M.; Moore, Dean A. "Chromium(III) hydrolysis constants and solubility of chromium(III) hydroxide" Inorganic Chemistry 1987, volume 26, pp. 345-9. doi:10.1021/ic00250a002
  3. Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils (1985). "Chromium". Lehrbuch der Anorganischen Chemie (in German) (91–100 ed.). Walter de Gruyter. pp. 1081–1095. ISBN 3-11-007511-3.
  4. "Bracewellite".
  5. "Grimaldiite".
  6. "Guyanaite".
  7. "List of Minerals". 21 March 2011.
Chromium compounds
Chromium(0)
Organochromium(0) compounds
  • Cr(C6H6)2
  • CrC6H6(CO)3
    • Chromium(I)
    Organochromium(I) compounds
    Chromium(II)
    Organochromium(II) compounds
    Chromium(II, III)
    Chromium(III)
    Chromium(IV)
    Chromium(V)
    Chromium(VI)
    Polyatomic ion
    Hydroxides
    HOH He
    LiOH Be(OH)2 B(OH)3 C(OH)4 N(OH)3
    [NH4]OH     		O(OH)2 FOH Ne
    NaOH Mg(OH)2 Al(OH)3 Si(OH)4 P(OH)3 S(OH)2 ClOH Ar
    KOH Ca(OH)2 Sc(OH)3 Ti(OH)2
    Ti(OH)3
    Ti(OH)4     		V(OH)2
    V(OH)3     		Cr(OH)2
    Cr(OH)3     		Mn(OH)2 Fe(OH)2
    Fe(OH)3     		Co(OH)2 Ni(OH)2 CuOH
    Cu(OH)2     		Zn(OH)2 Ga(OH)3 Ge(OH)2 As(OH)3 Se BrOH Kr
    RbOH Sr(OH)2 Y(OH)3 Zr(OH)4 Nb Mo Tc(OH)4 Ru Rh(OH)3 Pd AgOH Cd(OH)2 In(OH)3 Sn(OH)2
    Sn(OH)4     		Sb(OH)3 Te(OH)6 IOH Xe
    CsOH Ba(OH)2 * Lu(OH)3 Hf Ta W Re Os Ir Pt Au(OH)3 Hg(OH)2 TlOH
    Tl(OH)3     		Pb(OH)2
    Pb(OH)4     		Bi(OH)3 Po At Rn
    FrOH Ra(OH)2 ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
     
    * La(OH)3 Ce(OH)3
    Ce(OH)4     		Pr(OH)3 Nd(OH)3 Pm(OH)3 Sm(OH)3 Eu(OH)2
    Eu(OH)3     		Gd(OH)3 Tb(OH)3 Dy(OH)3 Ho(OH)3 Er(OH)3 Tm(OH)3 Yb(OH)3
    ** Ac(OH)3 Th(OH)4 Pa U(OH)2
    U(OH)3
    UO2(OH)2     		Np(OH)3
    Np(OH)4
    NpO2(OH)3     		Pu Am(OH)3 Cm(OH)3 Bk Cf Es Fm Md No
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