Chromium(III) nitrate

Chemical compound
Chromium(III) nitrate

Chemical structure of [Cr(H2O)6](NO3)3
Names
IUPAC name
Chromium(III) nitrate
Other names
Nitric acid, chromium(3+) salt
Identifiers
CAS Number
  • 13548-38-4 (anhydrous) checkY
  • 7789-02-8 (nonahydrate) checkY
3D model (JSmol)
  • Interactive image
ChemSpider
  • 15285818 checkY
ECHA InfoCard 100.033.550 Edit this at Wikidata
PubChem CID
  • 24598
RTECS number
  • GB6300000
UNII
  • C6H0RE016B (anhydrous) checkY
  • D2806IOL1L (nonahydrate) checkY
UN number 2720
CompTox Dashboard (EPA)
  • DTXSID8065531 Edit this at Wikidata
InChI
  • InChI=1S/Cr.3NO3/c;3*2-1(3)4/q+2;3*-1 checkY
    Key: BXWGVGRRIQRLLZ-UHFFFAOYSA-N checkY
  • InChI=1/Cr.3NO3/c;3*2-1(3)4/q+2;3*-1
    Key: BXWGVGRRIQRLLZ-UHFFFAOYAO
  • [Cr+3].O=N([O-])=O.[O-]N(=O)=O.[O-]N(=O)=O
Properties
Chemical formula
 Cr(NO3)3 (anhydrous)
[Cr(H2O)6](NO3)3•3H2O (nonahydrate)
Molar mass 238.011 g/mol (anhydrous)
400.21 g/mol (nonahydrate)
Appearance Blue-violet crystals (anhydrous)
Purple crystals (nonahydrate)
Density 1.85 g/cm3 (nonahydrate)
Melting point 60.06 °C (140.11 °F; 333.21 K) nonahydrate
Boiling point > 100 °C (212 °F; 373 K) (decomposes)
Solubility in water
 81 g/100 mL (20 °C)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
3
0
1
OX
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (median dose)
 3250 mg/kg (rat, oral, nonahydrate)
110 mg/kg (mouse, oral)[1]
Safety data sheet (SDS) Oxford MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)
Infobox references
Chemical compound

Chromium(III) nitrate describes several inorganic compounds consisting of chromium, nitrate and varying amounts of water. Most common is the dark violet hygroscopic solid. An anhydrous green form is also known. Chromium(III) nitrate compounds are of a limited commercial importance, finding some applications in the dyeing industry.[2] It is common in academic laboratories for the synthesis of chromium coordination complexes.

Structure

The relatively complicated formula - [Cr(H2O)6](NO3)3•3H2O - betray a simple structure of this material. The chromium centers are bound to six aquo ligands, and the remaining volume of the solid is occupied by three nitrate anions and three molecules of water of crystallization.[3]

Properties and preparation

The anhydrous salt forms green crystals and is very soluble in water (in contrast to anhydrous chromium(III) chloride which dissolves very slowly except under special conditions). At 100 °C it decomposes. The red-violet hydrate is highly soluble in water. Chromium nitrate is used in the production of alkali metal-free catalysts and in pickling.

Chromium nitrate can be prepared by dissolving chromium oxide in nitric acid.[2]

References

  1. ^ "Chromium(III) compounds [as Cr(III)]". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  2. ^ a b Anger, Gerd; Halstenberg, Jost; Hochgeschwender, Klaus; Scherhag, Christoph; Korallus, Ulrich; Knopf, Herbert; Schmidt, Peter; Ohlinger, Manfred (2000). "Chromium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a07_067. ISBN 3527306730.
  3. ^ Lazar, D.; Ribár, B.; Divjaković, V.; Mészáros, Cs. (1991). "Structure of Hexaaquachromium(III) Nitrate Trihydrate". Acta Crystallographica Section C Crystal Structure Communications. 47 (5): 1060–1062. doi:10.1107/S0108270190012628.
  • v
  • t
  • e
Chromium(0)
  • Cr(CO)6
Organochromium(0) compounds
  • Cr(C6H6)2
  • CrC6H6(CO)3
    • Chromium(I)
    • CrH
    Organochromium(I) compounds
    • Cr2(C5H5)2(CO)6
    Chromium(II)
    • CrH2
    • Cr3C2
    • Cr(C2O4)
    • Cr(CH3CO2)2
    • CrSi2
    • CrO
    • CrS
    • CrSO4
    • CrSe
    • CrF2
    • CrCl2
    • CrBr2
    • CrI2
    Organochromium(II) compounds
    • Cr(C5H5)2
    Chromium(II, III)
    • Cr3C2
    Chromium(III)
    • CrB
    • [Cr3O(CH3CO2)6(H2O)3]+[CH3CO2]−
    • CrN
    • Cr(NO3)3
    • CrPO4
    • Cr2O3
    • Cr(OH)3
    • Cr2S3
    • Cr2(SO4)3
    • Cr2Te3
    • CrF3
    • CrCl3
    • Cr(ClO4)3
    • CrBr3
    • CrI3
    Chromium(IV)
    • CrSi
    • CrO2
    • CrF4
    • CrCl4
    • CrBr4
    • CrI4
    Chromium(V)
    • K3Cr(O2)4
    • CrF5
    Chromium(VI)
    • CrO3
    • CrO(O2)2
    • H2CrO4/H2Cr2O7
    • CrO2F2
    • CrOF4
    • CrO2Cl2
    • CrO2Br2
    • [C5H5NH]+CrO3Cl−
    • CrF6 (hypothetical)
    Polyatomic ion
    • v
    • t
    • e
    Salts and covalent derivatives of the nitrate ion
    HNO3 He
    LiNO3 Be(NO3)2 B(NO3)−4 RONO2
    +CO3
    +C2O4     		NO3-
    NH4NO3     		HOONO2 FNO3
    +F     		Ne
    NaNO3 Mg(NO3)2 Al(NO3)3
    Al(NO3)−4     		Si P +SO4 ClONO2
    +Cl     		Ar
    KNO3 Ca(NO3)2 Sc(NO3)3 Ti(NO3)4 VO(NO3)3 Cr(NO3)3 Mn(NO3)2 Fe(NO3)2
    Fe(NO3)3     		Co(NO3)2
    Co(NO3)3     		Ni(NO3)2 CuNO3
    Cu(NO3)2     		Zn(NO3)2 Ga(NO3)3 Ge As +SeO3 BrNO3
    +Br     		Kr
    RbNO3 Sr(NO3)2 Y(NO3)3 Zr(NO3)4 NbO(NO3)3 MoO2(NO3)2 Tc Ru Rh(NO3)3 Pd(NO3)2
    Pd(NO3)4     		AgNO3
    Ag(NO3)2     		Cd(NO3)2 In(NO3)3 Sn(NO3)4 Sb4O4(OH)2(NO3)2 Te INO3
    +IO3     		Xe(NO3)2
    CsNO3 Ba(NO3)2 * Lu(NO3)3 Hf(NO3)4 TaO(NO3)3 WO2(NO3)2 ReO3NO3 Os Ir3O(NO3)10 Pt(NO3)2 Au(NO3)3 Hg2(NO3)2
    Hg(NO3)2     		TlNO3
    Tl(NO3)3     		Pb(NO3)2 Bi(NO3)3
    BiO(NO3)     		Po(NO3)4 At Rn
    FrNO3 Ra(NO3)2 ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
     
    * La(NO3)3 Ce(NO3)3
    Ce(NO3)4     		Pr(NO3)3 Nd(NO3)3 Pm(NO3)3 Sm(NO3)3 Eu(NO3)3 Gd(NO3)3 Tb(NO3)3 Dy(NO3)3 Ho(NO3)3 Er(NO3)3 Tm(NO3)3 Yb(NO3)3
    ** Ac(NO3)3 Th(NO3)4 PaO(NO3)3 UO2(NO3)2 Np(NO3)4 Pu(NO3)4 Am(NO3)3 Cm(NO3)3 Bk(NO3)3 Cf(NO3)3 Es Fm Md No