Aluminium chloride

Aluminium chloride (AlCl₃), is a chemical compound. It is a white or yellow crystalline solid. It melts at a low temperature. It is made by reacting aluminium oxide with hydrochloric acid. The anhydrous (without water) form may be made by reacting aluminium and chlorine. It is used in the making of chemicals. It is also used in deodorants. It can cause slight irritation.

Aluminium chloride

Names
IUPAC name aluminium chloride
Other names aluminium(III) chloride aluminum trichloride
Identifiers
CAS Number	7446-70-0 (anhydrous) Y 10124-27-3 (hydrate) N 7784-13-6 (hexahydrate) N
3D model (JSmol)	Interactive image dimer: Interactive image
ChEBI	CHEBI:30114 Y
ChemSpider	22445 Y
ECHA InfoCard	100.028.371
Gmelin Reference	1876
PubChem CID	24012
RTECS number	BD0530000
UNII	LIF1N9568Y Y
CompTox Dashboard (EPA)	DTXSID6029674
SMILES Cl[Al](Cl)Cl dimer: Cl[Al-]1(Cl)[Cl+][Al-]([Cl+]1)(Cl)Cl
Properties
Chemical formula	AlCl3
Molar mass	133.341 g/mol (anhydrous) 241.432 g/mol (hexahydrate)[1]
Appearance	white or pale yellow solid, hygroscopic
Density	2.48 g/cm3 (anhydrous) 2.398 g/cm3 (hexahydrate)[1]
Melting point	192.6 °C (378.7 °F; 465.8 K) (anhydrous)[1] 100 °C (212 °F; 373 K) (hexahydrate, dec.)[1]
Boiling point	180 °C (356 °F; 453 K) (sublimes)[1]
Solubility in water	439 g/l (0 °C) 449 g/l (10 °C) 458 g/l (20 °C) 466 g/l (30 °C) 473 g/l (40 °C) 481 g/l (60 °C) 486 g/l (80 °C) 490 g/l (100 °C)
Solubility	soluble in hydrogen chloride, ethanol, chloroform, carbon tetrachloride slightly soluble in benzene
Vapor pressure	133.3 Pa (99 °C) 13.3 kPa (151 °C)[2]
Viscosity	0.35 cP (197 °C) 0.26 cP (237 °C)[2]
Structure
Crystal structure	Monoclinic, mS16
Space group	C12/m1, No. 12[3]
Lattice constant	a = 0.591 nm , b = 0.591 nm , c = 1.752 nm[3]
Lattice volume (V)	0.52996 nm3
Formula units (Z)	6
Coordination geometry	Octahedral (solid) Tetrahedral (liquid)
Molecular shape	Trigonal planar (monomeric vapour)
Thermochemistry
Std enthalpy of formation ΔfHo298	−704.2 kJ/mol[4]
Standard molar entropy So298	109.3 J/mol·K[4]
Specific heat capacity, C	91.1 J/mol·K[4]
Pharmacology
ATC code	D10AX01 (WHO)
Hazards
NFPA 704	0 3 2
U.S. Permissible exposure limit (PEL)	none
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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Infobox references

Related pages

• Calcium chloride
• Deodorant
• Sodium bromide