Description
Chromic sulfate is a dark green to violet crystalline material. Used in paints and inks, ceramics, and in textile dyeing. It is noncombustible. The primary hazard of this material is the potential for environmental damage if released. Immediate steps should be taken to limit its spread to the environment.;Liquid
IUPAC Name
chromium(3+);trisulfate
Molecular Weight
392.2g/mol
Molecular Formula
Cr2(SO4)3;Cr2O12S3
InChI
InChI=1S/2Cr.3H₂O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+3;;;/p-6
InChI Key
GRWVQDDAKZFPFI-UHFFFAOYSA-H
Boiling Point
Loses water of hydration at 212.0° Fr 2 (SO 4 ) 3 . 18 loses 12 Cr 2 (SO 4 ) 3 . 15 loses 10 (USCG, 1999)
Melting Point
212 °F (USCG, 1999);Decomposes >700 °C
Density
3.012 at 68° F for anhydrous salt Hydrated: 1.867 at 17 for 15 H 2 O; 1.7 at 22 for 18 H 2 O (USCG, 1999);3.012
Solubility
Practically insoluble in water;Insoluble in water but dissolves to form complexes when reducing agents are added.;Practically insoluble in acids;Soluble in alcohol
Color Form
Peach-colored solid;Red powder;Violet or red powder
Complexity
62.2
Covalently-Bonded Unit Count
5
Decomposition
When heated to decomposition it emits toxic vapors of /sulfur oxides and chromium/.
EC Number
233-253-2;604-448-3
Exact Mass
391.736199g/mol
Formal Charge
0
H-Bond Acceptor
12
H-Bond Donor
0
Heavy Atom Count
17
MeSH Entry Terms
basic chromium sulfate;chromium (+2) sulfate (1:1);chromium (+3) sulfate (3:2);chromium (+3) sulfate (3:2), hexahydrate;chromium (+3) sulfate (3:2), pentadecahydrate;chromium sulfate;chromium sulfate basic;chromosulfuric acid
Monoisotopic Mass
391.736199g/mol
Other Experimental
Hygroscopic in moist air;Green crystals; soluble in water, insoluble in alcohol /15 H20 Hydrate/;In water, 64 g/100g water at 25 °C /Chromium III sulfate hydrate/;Violet cubes; soluble in water and alcohol /18 H20 Hydrate/;Violet, amorphous scales; specific gravity: 1.867 at 17 °C; MP: 100 °C; BP: lose 10 waters at 100 °C; soluble in cold water; decomposes at 67 °C; insouble in alcohol /Cr2(SO4)3.15 H₂O/;Blue violet, cubic octahedral; index of refraction: 1.564; specific gravity: 1.7 at 22 °C; MP: lose 12 water at 100 °C; 120 g/100 mL water at 20 °C; soluble in hot water and alcohol /Cr2(SO4)3.18 H₂O/;Chromium forms a number of compounds in various oxidation states. Those of 2+ (chromous), 3+ (chromic) and 6+ (chromates) are the most important /Chromium, alloys and cmpd/;Chromium(III) compounds are reduced to Cr(II) compounds by hypophosphites, electrolysis, or reducing metals, such as zinc, magnesium, & aluminum in acid soln (although it should be noted that Cr(II) compounds are stable only in the absence of air). In basic solution, Cr(III) is readily oxidized to chromium oxide (CrO4(-2)) by hypochlorite, hypobromite, peroxide, & oxygen under pressure at high temperature. In acid solution, Cr(III) is difficult to oxidize & needs strong oxidizing agents, such as concentrated perchloric acid, sodium bismuthate, & permanganate. /Trivalent chromium/;Cr(III) is the most stable oxidation state of chromium & is always present as a coordination complex /Trivalent chromium/;Slightly soluble in water. /Trivalent chromium/
Rotatable Bond Count
0
Stability
Stable under recommended storage conditions./Chromium(III) sulfate hydrate/
UNII
Y0C99N5TMZ
UN Number
2240;3077;2240
