Chromium(III) sulfate

Chromium(III) sulfate

Names
IUPAC name Chromium(III) sulfate
Other names Basic chromium sulfate, chromic sulfate
Identifiers
CAS Number	10101-53-8 Y 15244-38-9 (decahydrate) Y 10031-37-5 (pentadecahydrate) Y 13520-66-6 (octadecahydrate) N
3D model (JSmol)	anhydrous: Interactive image dodecahydrate: Interactive image
ChEBI	CHEBI:53471
ChemSpider	23304 Y
ECHA InfoCard	100.030.217
EC Number	233-253-2
PubChem CID	24930
UNII	Y0C99N5TMZ Y 8Q759N78CX (decahydrate) Y E4T8TU3LE8 (pentadecahydrate) Y
UN number	2240 3077
CompTox Dashboard (EPA)	DTXSID20890642
InChI InChI=1S/2Cr.3H2O4S.12H2O/c;;3*1-5(2,3)4;;;;;;;;;;;;/h;;3*(H2,1,2,3,4);12*1H2/q2*+3;;;;;;;;;;;;;;;/p-6 N Key: ANNXSSGQVXBUEI-UHFFFAOYSA-H N InChI=1/2Cr.3H2O4S.12H2O/c;;3*1-5(2,3)4;;;;;;;;;;;;/h;;3*(H2,1,2,3,4);12*1H2/q2*+3;;;;;;;;;;;;;;;/p-6 Key: ANNXSSGQVXBUEI-CYFPFDDLAL
SMILES anhydrous: [Cr+3].[Cr+3].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O dodecahydrate: [OH2+][Cr-3]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[OH2+][Cr-3]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O
Properties
Chemical formula	Cr2(SO4)3 • 12H2O
Molar mass	392.16 g/mol 608.363 g/mol (dodecahydrate) 716.45 g/mol (octadecahydrate)
Appearance	reddish-brown crystals (anhydrous), purple crystals (hydrated)
Density	3.10 g/cm3 (anhydrous) 1.86 g/cm3 (pentadecahydrate) 1.709 g/cm3 (octadecahydrate)
Melting point	90 °C
Boiling point	>700 °C (decomposes to chromic acid)
Solubility in water	insoluble (anhydrous) soluble (hydrated)
Solubility	soluble in alcohol practically insoluble in acid
Magnetic susceptibility (χ)	+11,800·10−6 cm3/mol
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H314, H317, H332, H334, H335, H340, H350, H373, H412
Precautionary statements	P201, P202, P260, P261, P264, P271, P272, P273, P280, P281, P285, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P304+P341, P305+P351+P338, P308+P313, P310, P312, P314, P321, P333+P313, P342+P311, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)	1 0 0
Flash point	Non-flammable
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3[1]
REL (Recommended)	TWA 0.5 mg/m3[1]
IDLH (Immediate danger)	250 mg/m3[1]
Safety data sheet (SDS)	MSDS
Related compounds
Other cations	Aluminium sulfate
Related double salts	Chrome alum
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Chromium(III) sulfate usually refers to the inorganic compounds with the formula Cr₂(SO₄)₃^.x(H₂O), where x can range from 0 to 18. Additionally, ill-defined but commercially important "basic chromium sulfates" are known. These salts are usually either violet or green solids that are soluble in water. It is commonly used in tanning leather.