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Chromium nitrate

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Title: Chromium nitrate  
Author: World Heritage Encyclopedia
Language: English
Subject: Nitrates, Potassium tetraperoxochromate(V), Chromium(III) iodide, Chromium(VI) oxide peroxide, Chromyl fluoride
Collection: Chromium Compounds, Nitrates, Oxidizing Agents
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Chromium nitrate

Chromium nitrate
Identifiers
CAS number  YesY,  (nonahydrate) YesY
PubChem
ChemSpider  YesY
UNII  YesY
UN number 2720
RTECS number GB6300000
Jmol-3D images Image 1
Properties
Molecular formula Cr(NO3)3
[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
MSDS Oxford MSDS
EU Index Not listed
NFPA 704
0
3
1
OX
Flash point Non-flammable
LD50 3250 mg/kg (rat, oral, nonahydrate)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY   YesY/N?)

Chromium(III) nitrate describes several anhydrous green form is also known. Chromium(III) nitrate compounds are of a limited importance commercially, finding some applications in the dyeing industry.[1] It is common in academic laboratories for the synthesis of chromium coordination complexes.

Structure

The relatively complicated formula - [Cr(H2O)6](NO3)33H2O - highlights the complicated structure of this material. The chromium centers are bound to six water ligands, and the remaining volume of the solid is occupied by three nitrate anions and three molecules of water of crystallization. Such complicated formulas typify hydrated metal salts.

Properties and preparation

The anhydrous salt forms green crystals and very soluble in water. 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.[1]

References

  1. ^ a b Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger, "Chromium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.
Salts and the ester of the Nitrate ion
HNO3 He
LiNO3 Be(NO3)2 B(NO3)4- RONO2 NO3-
NH4NO3
O FNO3 Ne
NaNO3 Mg(NO3)2 Al(NO3)3 Si P S ClONO2 Ar
KNO3 Ca(NO3)2 Sc(NO3)3 Ti(NO3)4 VO(NO3)3 Cr(NO3)3 Mn(NO3)2 Fe(NO3)3 Co(NO3)2,
Co(NO3)3
Ni(NO3)2 Cu(NO3)2 Zn(NO3)2 Ga(NO3)3 Ge As Se Br Kr
RbNO3 Sr(NO3)2 Y Zr(NO3)4 Nb Mo Tc Ru Rh Pd(NO3)2 AgNO3 Cd(NO3)2 In Sn Sb Te I XeFNO3
CsNO3 Ba(NO3)2   Hf Ta W Re Os Ir Pt Au Hg2(NO3)2,
Hg(NO3)2
Tl(NO3)3 Pb(NO3)2 Bi(NO3)3 Po At Rn
Fr Ra   Rf Db Sg Bh Hs Mt Ds Rg Cn Uut Fl Uup Lv Uus Uuo
La Ce(NO3)x Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Ac Th Pa UO2(NO3)2 Np Pu Am Cm Bk Cf Es Fm Md No Lr
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