Chromous acid

Description

Chromous acid · CAS 10049-05-5 · Cl2Cr. UNII CET32HKA21. Boiling Point: 1200 °C; Boiling Point: 1300 °C; Boiling Point: 1300 °C @760 [mm Hg].

Identification

CAS Registry Number	10049-05-5
PubChem CID	24871
Molecular formula	Cl2Cr
IUPAC name	dichlorochromium
UNII (FDA)	CET32HKA21

Computed Descriptors

Molecular Weight	122.90
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	0
Exact Mass	121.878210
Monoisotopic Mass	121.878210
Topological Polar Surface Area	0
Heavy Atom Count	3
Formal Charge	0
Complexity	2.8

Physical & Chemical Properties

Boiling Point	1200 °C
Boiling Point	1300 °C
Boiling Point	1300 °C @760 [mm Hg]
Melting Point	1515 °F (USCG, 1999)
Melting Point	824 °C
Density	2.751 at 14 °C/4 °C
Density	2.8 g/cm³
Density	2.751 @ 14°C

Physical description & handling notes

• Chromous chloride appears as 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. It is used to make other chemicals and as an oxygen absorbent.
• Very hygroscopic solid; [Merck Index] Steel-gray lustrous crystals or powder; [MSDSonline]
• VERY HYGROSCOPIC SOLID IN VARIOUS FORMS.
• Lustrous needles or fused, fibrous mass
• White deliquescent needles
• Gives blue solution when dissolved in water

GHS Hazard Classification

Reported hazard statements	H302 (100%), H315 (88.9%), H319 (88.9%), H335 (86.7%)

Documented Uses

• Used in chromium plating and as a catalyst, oxygen absorbent, and textile mordant; [HSDB]
• Electroplating [Category: Plate]
• Textiles (Printing, Dyeing, or Finishing) [Category: Industry]
• In chromizing; in preparation of Cr metal; in catalysts for organic reactions; as O2 absorbent; in analysis
• Reducing agent, catalyst, reagent, chromizing.
• Chromous chloride reaction followed by gas-liquid chromatography analysis is described for simultaneous confirmation of heptachlor & endrin residues.

Synonyms

CHROMOUS CHLORIDE; Dichlorochromium; Chromium(II) chloride (1:2); chromium (II) chloride; CET32HKA21; RefChem:125926; DTXCID601334652; 233-163-3; 10049-05-5; CHROMIUM CHLORIDE (CrCl2); Chromium dichloride; chromium(II) chloride; DTXSID20905548; CrCl2; Chromium(II) chloride, anhydrous; HSDB 988

Frequently Asked Questions

What are the CAS number and molecular formula of Chromous acid?

CAS 10049-05-5; molecular formula Cl2Cr; molecular weight — g/mol.

What other names is Chromous acid known by?

CHROMOUS CHLORIDE, Dichlorochromium, Chromium(II) chloride (1:2), chromium (II) chloride, CET32HKA21, RefChem:125926.

Is Chromous acid classified as hazardous?

Hazard statements reported: H302, H315, H319, H335.

What are the key physical properties of Chromous acid?

Boiling Point: 1200 °C; Boiling Point: 1300 °C; Boiling Point: 1300 °C @760 [mm Hg]; Melting Point: 1515 °F (USCG, 1999).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.