Cobalt(II) sulfate

Cobalt(II) sulfate
Names
	IUPAC name Cobalt(II) sulfate
	Other names Cobaltous sulfate
Identifiers
CAS Number	10124-43-3 ; 13455-34-0 (monohydrate) ; 10026-24-1 (heptahydrate) ;
3D model (JSmol)	anhydrous: Interactive image; hexahydrate: Interactive image; heptahydrate: Interactive image;
ChEBI	CHEBI:53470 ;
ChemSpider	23338 ;
ECHA InfoCard	100.030.291
EC Number	233-334-2;
KEGG	C17383; C19215 (heptahydrate);
PubChem CID	24965;
RTECS number	GG3100000 (anhydrous) ; GG3200000 (heptahydrate);
UNII	H7965X29HX ; Y8N698ZE0T (heptahydrate) ;
CompTox Dashboard (EPA)	DTXSID1031042 ;
	InChI InChI=1S/Co.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: KTVIXTQDYHMGHF-UHFFFAOYSA-L ; InChI=1/Co.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: KTVIXTQDYHMGHF-NUQVWONBAJ;
	SMILES anhydrous: [Co+2].[O-]S([O-])(=O)=O; hexahydrate: [OH2+][Co-4]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[O-]S(=O)(=O)[O-]; heptahydrate: [OH2+][Co-4]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[O-]S(=O)(=O)[O-].O;
Properties
Chemical formula	CoSO4·(H2O)n (n=0,1,6,7)
Molar mass	154.996 g/mol (anhydrous) ; 173.01 g/mol (monohydrate) ; 263.08 g/mol (hexahydrate) ; 281.103 g/mol (heptahydrate)
Appearance	reddish crystalline (anhydrous, monohydrate) ; pink salt (hexahydrate)
Odor	odorless (heptahydrate)
Density	3.71 g/cm3 (anhydrous) ; 3.075 g/cm3 (monohydrate) ; 2.019 g/cm3 (hexahydrate) ; 1.948 g/cm3 (heptahydrate)
Melting point	735 °C (1,355 °F; 1,008 K)
Solubility in water	anhydrous: ; 36.2 g/100 mL (20 °C) ; 38.3 g/100 mL (25 °C) ; 84 g/100 mL (100 °C) heptahydrate: ; 60.4 g/100 mL (3 °C) ; 67 g/100 mL (70 °C)
Solubility	anhydrous: ; 1.04 g/100 mL (methanol, 18 °C) ; insoluble in ammonia heptahydrate: ; 54.5 g/100 mL (methanol, 18 °C)
Magnetic susceptibility (χ)	+10,000·10−6 cm3/mol
Refractive index (nD)	1.639 (monohydrate) ; 1.540 (hexahydrate) ; 1.483 (heptahydrate)
Structure
Crystal structure	orthorhombic (anhydrous) ; monoclinic (monohydrate, heptahydrate)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H317, H334, H341, H350, H360, H410
Precautionary statements	P201, P202, P261, P264, P270, P272, P273, P280, P281, P285, P301+P312, P302+P352, P304+P341, P308+P313, P321, P330, P333+P313, P342+P311, P363, P391, P405, P501
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	424 mg/kg (oral, rat)
Safety data sheet (SDS)	ICSC 1396 (heptahydrate)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Cobalt(II) sulfate is any of the inorganic compounds with the formula CoSO₄(H₂O)_x. Usually cobalt sulfate refers to the hexa- or heptahydrates CoSO₄^.6H₂O or CoSO₄^.7H₂O, respectively. The heptahydrate is a red solid that is soluble in water and methanol. Since cobalt(II) has an odd number of electrons, its salts are paramagnetic.