CHROMIUM(III) NITRATE NONAHYDRATE Chemical Properties

Melting point:

60 °C(lit.)

Boiling point:

100°C

bulk density

710kg/m3

Density 

1.80 g/mL(lit.)

storage temp. 

Store at +15°C to +25°C.

solubility 

H2O: very soluble(lit.)

form 

Solid

color 

Violet to black

PH

2-3 (50g/l, H2O, 20℃)

Water Solubility 

Soluble in water and alcohol.

Merck 

14,2226

Exposure limits

NIOSH: IDLH 25 mg/m3; TWA 0.5 mg/m3

Stability:

Stable at room temperature, but may explode if heated. Incompatible with organic materials, reducing agents. Use polyethylene tools.

CAS DataBase Reference

7789-02-8(CAS DataBase Reference)

Safety Information

Hazard Codes 

O,Xi

Risk Statements 

8-36/38

Safety Statements 

17-26-36

RIDADR 

UN 2720 5.1/PG 3

WGK Germany 

2

RTECS 

GB6300000

F 

9

TSCA 

Yes

HS Code 

2834 29 80

HazardClass 

5.1

PackingGroup 

III

Toxicity

LD50 orally in Rabbit: 3250 mg/kg

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

CHROMIUM(III) NITRATE NONAHYDRATE Usage And Synthesis

Chemical Properties

deep blue or violet crystals

Chemical Properties

Chromium nitrate is a crystalline substance, variously stated to be green brown or purple and existing in various hydrated forms.

Uses

Chromium nitrate is used in the manufacture of alkali metal-free catalysts and in preservation. It is used in the preparation of chrome catalysts, in textile printing operations, and as a corrosion inhibitor. Chromium(III) nitrate as a source of chromium is added to food supplements for nutritional purposes .

reaction suitability

reagent type: catalyst
core: chromium

Potential Exposure

Chromium nitrate is used in the preparation of chrome catalysts, in textile printing operations; and as a corrosion inhibitor. Used to make other chemicals.

Shipping

UN2720 Chromium nitrate, Hazard Class: 5.1; Labels: 5.1-Oxidizer

Purification Methods

The pure deep violet nonahydrate salt is best prepared freshly from pure recrystallised (3 times) chromium (VI) trioxide and pure nitric acid. A solution is prepared by dissolving 1g of CrO3 in 3mL of H2O and 2mL of pure HNO3, and carefully, with stirring (behind a screen) pure MeOH (0.5-1.0mL) is added dropwise carefully (shield) with cooling to avoid a violent reaction. A bluish colour develops as Cr(VI) is reduced to Cr(III). When this solution is diluted to 130,000ppm of the salt, analysis detected by ICP/MS gave the following trace elements (ppm in brackets): Sr (33), Na (3.5), Mo, Ni, Cu, Si and Mg (0.13 each), Se, Zn, Al (0.026 each), Ti (1.5), Fe (4.9), Co (0.07), Sn (0.065), Ba (0.013 and W (0.078). Evaporation of the methanolic solution in high vacuum over CaCl2 eventually yields pure deep violet rhombic crystals of chromium (III) nitrate nonahydrate. An aqueous solution of this salt becomes green on heating but reverts to the violet colour on cooling.

Incompatibilities

This chemical is a strong oxidizer. Contact with reducing agents; fuels, ethers, and other flammable and combustible materials cause a fire and explosion hazard. Violent reaction with many compounds, including reducing agents; alcohols, chemically active metals; combustible materials, strong acids, alkaline earth sulfides, aluminum carbides, aluminum, amines, calcium sulfide, carbides, chlorine trifluoride, glycerin, hydrides, hydrochloric acid, hydrogen peroxide, hydrogen sulfide, hydroxylamine, magnesium, metal powders, metal sulfides, molybdenum, phenylhydrazine, phosphorous red/friction, phosphorous trichloride, silicon, sulfides, sulfur, sulfur Chromium Nitrate 845 dioxide, sulfur/friction, sulfuric acid, tungsten, hydrogen trisulfide

Waste Disposal

Precipitate chromium as the hydroxide. Dewater the sludge and dispose of in singlepurpose dumps.

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