Chromium(III) chloride
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Chromium(III) chloride (also called chromic chloride) is an inorganic chemical compound with the chemical formula CrCl3. It forms several hydrates with the formula CrCl3·nH2O, among which are hydrates where n can be 5 (chromium(III) chloride pentahydrate CrCl3·5H2O) or 6 (chromium(III) chloride hexahydrate CrCl3·6H2O). The anhydrous compound with the formula CrCl3 are violet crystals, while the most common form of the chromium(III) chloride are the dark green crystals of hexahydrate, CrCl3·6H2O. Chromium chlorides find use as catalysts and as precursors to dyes for wool.
Quick Facts Names, Identifiers ...
Anhydrous | |
Hexahydrate | |
Names | |
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IUPAC name
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Other names
Chromic chloride | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChEMBL | |
ChemSpider |
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DrugBank | |
ECHA InfoCard | 100.030.023 |
1890 130477 532690 | |
PubChem CID |
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RTECS number |
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UNII |
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CompTox Dashboard (EPA) |
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Properties | |
CrCl3 | |
Molar mass | 158.36 g/mol (anhydrous) 266.45 g/mol (hexahydrate)[1] |
Appearance | Purple (anhydrous), dark green (hexahydrate) |
Density | 2.87 g/cm3 (anhydrous) 1.760 g/cm3 (hexahydrate) |
Melting point | 1,152 °C (2,106 °F; 1,425 K) (anhydrous) 81 °C (hexahydrate)[2] |
Boiling point | 1,300 °C (2,370 °F; 1,570 K) decomposes |
slightly soluble (anhydrous) 585 g/L (hexahydrate) | |
Solubility | insoluble in ethanol insoluble in ether, acetone |
Acidity (pKa) | 2.4 (0.2M solution) |
+6890.0·10−6 cm3/mol | |
Structure | |
YCl3 structure | |
Octahedral | |
Hazards | |
GHS labelling: | |
Danger | |
H302, H314, H411 | |
P260, P264, P270, P273, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P330, P363, P391, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
1870 mg/kg (oral, rat)[4] |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 1 mg/m3[5] |
REL (Recommended) |
TWA 0.5 mg/m3[5] |
IDLH (Immediate danger) |
250 mg/m3[5] |
Safety data sheet (SDS) | ICSC 1316 (anhydrous) ICSC 1532 (hexahydrate) |
Related compounds | |
Other anions |
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Other cations |
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Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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