| Identification | More | [Name]
CHROMIUM(II) CHLORIDE | [CAS]
10049-05-5 | [Synonyms]
CHROME CHLORIDE
CHROMIUM DICHLORIDE
CHROMIUM(II) CHLORIDE
CHROMIUM (OUS) CHLORIDE
CHROMOUS CHLORIDE
CRCL2
Chromium (ll) chloride anhydrous
Chromium chloride (CrCl2)
Chromium(ii) chloride (1:2)
chromium(ii)chloride(1:2)
chromiumchloride(crcl2)
chromous
Chromous acid
Chromium(II) chloride, anhydrous, powder, 99.99% metals basis
Chromium(II)chloride,anhydrous
Chromium(II) chloride, 99.90%
Chromium(II)chloride,anhydrous(99.9%-Cr)
Chromium(II) chloride, anhydrous, 99.9% (metals basis)
Chromous chloride: (Chromium(II) chloride(1:2))
Chromium(II) dichloride | [EINECS(EC#)]
233-163-3 | [Molecular Formula]
Cl2Cr | [MDL Number]
MFCD00010947 | [Molecular Weight]
122.9 | [MOL File]
10049-05-5.mol |
| Chemical Properties | Back Directory | [Appearance]
Chromous chloride is a white-to-bluish solid or lustrous needles which turn Blue in water | [Melting point ]
824 °C(lit.) | [Boiling point ]
1120°C (estimate) | [density ]
2.9 g/mL at 25 °C(lit.)
| [storage temp. ]
Store below +30°C. | [solubility ]
soluble in H2O | [form ]
powder
| [color ]
Off-white to green-gray | [Specific Gravity]
2.878 | [Stability:]
Stable, but decomposes in water or moist air. Incompatible with water, oxidizing agents, active metals. | [Water Solubility ]
Soluble in water. Insoluble in alcohol and ether. | [Sensitive ]
Air & Moisture Sensitive | [Merck ]
14,2244 | [Exposure limits]
NIOSH: IDLH 250 mg/m3; TWA 0.5 mg/m3 | [CAS DataBase Reference]
10049-05-5(CAS DataBase Reference) | [EPA Substance Registry System]
Chromium(II) chloride (10049-05-5) |
| Safety Data | Back Directory | [Hazard Codes ]
Xn | [Risk Statements ]
R22:Harmful if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing . | [WGK Germany ]
3
| [RTECS ]
GB5250000
| [F ]
1-10 | [TSCA ]
Yes | [HS Code ]
2827 39 85 | [Hazardous Substances Data]
10049-05-5(Hazardous Substances Data) | [Toxicity]
LD50 orally in rats: 1.87 g/kg (Smyth) |
| Hazard Information | Back Directory | [General Description]
A white crystalline solid. The primary hazard is the threat to the environment. Immediate steps must be taken to prevent its spread to the environment. CHROMOUS CHLORIDE(10049-05-5) is used to make other chemicals and as an oxygen absorbent. | [Reactivity Profile]
Inorganic reducing agents, such as CHROMOUS CHLORIDE, react with oxidizing agents to generate heat and products that may be flammable, combustible, or otherwise reactive. Their reactions with oxidizing agents may be violent. Long storage of a chromous chloride solution culminated in an explosion. This was ascribed to the slow buildup of hydrogen gas that was produced by reduction of water by the Cr(II) ion [MCA Case History No. 1660]. | [Air & Water Reactions]
Stable in dry air, but oxidizes rapidly in moist air or standing water with liberation of Hydrogen, [Merck, 11th ed., 1989]. Soluble in water. | [Health Hazard]
DUST: Harmful if inhaled. SOLID: Irritating to skin and eyes. Harmful if swallowed. | [Potential Exposure]
It is used in metal alloys and metal finishing; textile treatment including mothproofing, waterproofing, printing; and dying, leather tanning; making photographic chemicals; and green pigments for various uses. | [First aid]
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a Medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. | [Shipping]
UN3260 Corrosive solid, acidic, inorganic, n.o. s., Hazard class: 8; Labels: 8-Corrosive material, Technical Name Required. | [Incompatibilities]
Very hygroscopic. The substance is a strong reducing agent. Reacts with oxidizers. Reacts with water, forming flammable hydrogen gas | [Description]
Chromous chloride is a white-to-blue solid orlustrous needles which turn blue in water. Molecularweight =122.90; Boiling point =1300℃; Meltingpoint =824℃. Hazard Identification (based on NFPA-704M Rating System): Health 1, Flammability 0, Reactivity 0.Soluble in water. | [Chemical Properties]
Chromous chloride is a white-to-bluish solid or lustrous needles which turn Blue in water | [Chemical Properties]
grey green powder | [storage]
Color Code—Yellow Stripe (strong reducingagent): Reactivity Hazard; Store separately in an area isolated from flammables, combustibles, or other yellow-codedmaterials. Prior to working with chromous chloride youshould be trained on its proper handling and storage. Storein tightly closed containers in a cool, well-ventilated areaaway from water and moisture. Where possible, automatically pump liquid from drums or other storage containers toprocess containers. | [Purification Methods]
It is obtained from the dihydrate by heating in vacuo at 180o. It is a very hygroscopic white powder which dissolves in H2O to give a sky blue solution. It is stable in dry air but oxidises rapidly in moist air and should be stored in air tight containers. It sublimes at 800o in a current of HCl gas and should be cooled in the presence of HCl gas. Alternatively it can be washed with air-free Et2O and dried at 110-120o. [Burg Inorg Synth III 150 1950, Balthis & Bailar (4 H2O) Inorg Synth I 125 1939, Hein & Herzog in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II pp 1336-1338 1965.] |
| Questions And Answer | Back Directory | [Physical Properties]
White lustrous needles or fibrous mass; hygroscopic; highly soluble in water, forming blue solution; insoluble in ether. The tetrahydrate occurs in blue hygroscopic crystalline form, that changes to green modification above 38°C; decomposes to trihydrate at 51°C; soluble in water.
| [Uses]
Chromium(II) chloride is used as a reducing agent; as a catalyst in organic reactions; in chromium plating of metals; and as an analytical reagent for the dehalogenation of vic-dihalides. As a reducing agent, it is used to reduce alpha-haloketones to parent ketones, epoxides to olefins, chloroimides to imines, and aromatic aldehydes to corresponding alcohols.
| [Preparation]
Chromium(II) chloride may be prepared by the reaction of chromium with anhydrous hydrogen chloride at 600 to 700°C:
Cr + 2HCl → CrCl2 + H2
Also, the compound may be prepared by the reduction of chromium(III) chloride with hydrogen at 500 to 600°C:
2CrCl3 + H2→ 2CrCl2 + 2HCl
An aqueous solution of chromium(II) chloride for organic reduction may be prepared as follows:
Amalgamate zinc by shaking 400 g zinc dust with a solution containing 32g HgCl2, 20 mL conc. HCl and 400 mL water. Decant the aqueous phase. To the amalgamated zinc add 800 mL water, 80 mL conc. HCl, and 200 g CrCl3•6H2O. Bubble CO2 through the solution to agitate it and prevent any possible reoxidation of chromium by air. The solution that turns light blue may be used in organic reduction.
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