Chromium nitrate

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Chromium nitrate
Identifiers
CAS number13548-38-4 YesY, 7789-02-8 (nonahydrate) YesY
PubChem24598
ChemSpider15285818 YesY
UNIIC6H0RE016B YesY
UN number2720
RTECS numberGB6300000
Jmol-3D imagesImage 1
Properties
Molecular formulaCr(NO3)3
[Cr(H2O)6](NO3)3•3H2O (nonahydrate)
Molar mass238.011 g/mol (anhydrous)
400.21 g/mol (nonahydrate)
AppearanceBlue-violet crystals (anhydrous)
Purple crystals (nonahydrate)
Density1.85 g/cm3 (nonahydrate)
Melting point

60.06 °C, 333 K, 140 °F (nonahydrate)

Boiling point

> 100 °C (212 °F) (decomp.)

Solubility in water81 g/100 mL (20 °C)
Hazards
MSDSOxford MSDS
EU IndexNot listed
NFPA 704
NFPA 704.svg
0
3
1
OX
Flash pointNon flammable
LD503250 mg/kg (rat, oral, nonahydrate)
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references
 
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Chromium nitrate
Identifiers
CAS number13548-38-4 YesY, 7789-02-8 (nonahydrate) YesY
PubChem24598
ChemSpider15285818 YesY
UNIIC6H0RE016B YesY
UN number2720
RTECS numberGB6300000
Jmol-3D imagesImage 1
Properties
Molecular formulaCr(NO3)3
[Cr(H2O)6](NO3)3•3H2O (nonahydrate)
Molar mass238.011 g/mol (anhydrous)
400.21 g/mol (nonahydrate)
AppearanceBlue-violet crystals (anhydrous)
Purple crystals (nonahydrate)
Density1.85 g/cm3 (nonahydrate)
Melting point

60.06 °C, 333 K, 140 °F (nonahydrate)

Boiling point

> 100 °C (212 °F) (decomp.)

Solubility in water81 g/100 mL (20 °C)
Hazards
MSDSOxford MSDS
EU IndexNot listed
NFPA 704
NFPA 704.svg
0
3
1
OX
Flash pointNon flammable
LD503250 mg/kg (rat, oral, nonahydrate)
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chromium(III) nitrate describes several inorganic compounds consisting of chromium, nitrate and varying amounts of water. Most common is the dark violet hydrated solid, but an anhydrous green form is also known. These compounds are not important commercially but are commonly found in academic laboratories.

Contents

Structure

The relatively complicated formula - [Cr(H2O)6](NO3)3•3H2O - 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

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.

Preparation

Chromium nitrate can be prepared by dissolving chromium oxide in nitric acid.[1]

References

  1. ^ 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.