Nickel(II) sulfate

Nickel(II) sulfate
Anhydrous	Hexahydrate
Names
	IUPAC name Nickel(II) sulfate
	Other names Nickelous sulfate; Nickel (II) sulphate
Identifiers
CAS Number	7786-81-4 (anhydrous) ; 10101-97-0 (hexahydrate) ; 10101-98-1 (heptahydrate) ;
3D model (JSmol)	anhydrous: Interactive image; hexahydrate: Interactive image;
ChEBI	CHEBI:53001 ;
ChemSpider	22989 ;
ECHA InfoCard	100.029.186
EC Number	232-104-9;
PubChem CID	24586;
RTECS number	QR9600000;
UNII	4FLT4T3WUN ; JC9WZ4FK68 (hexahydrate) ; 596IDD57NR (heptahydrate) ;
CompTox Dashboard (EPA)	DTXSID6023787 ;
	InChI InChI=1S/Ni.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: LGQLOGILCSXPEA-UHFFFAOYSA-L ; InChI=1/Ni.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: LGQLOGILCSXPEA-NUQVWONBAG;
	SMILES anhydrous: [Ni+2].[O-]S([O-])(=O)=O; hexahydrate: [OH2+][Ni-4]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[O-]S(=O)(=O)[O-];
Properties
Chemical formula	NiSO4
Molar mass	154.75 g/mol (anhydrous); 262.85 g/mol (hexahydrate) ; 280.86 g/mol (heptahydrate)
Appearance	yellow-green solid (anhydrous) ; turquoise crystals (hexahydrate) ; turquoise crystals (heptahydrate)
Odor	odorless
Density	4.01 g/cm3 (anhydrous) ; 2.07 g/cm3 (hexahydrate) ; 1.948 g/cm3 (heptahydrate)
Melting point	1210 °C (anhydrous, at high pressure) ; 53 °C (hexahydrate)
Boiling point	> 640 °C (anhydrous, decomposes) ; 100 °C (hexahydrate, decomposes)
Solubility in water	65 g/100 mL (20 °C) ; 77.5 g/100 mL (30 °C) (heptahydrate)
Solubility	anhydrous ; insoluble in ethanol, ether, acetone hexahydrate ; insoluble in ethanol, ammonia heptahydrate ; soluble in alcohol
Acidity (pKa)	4.5 (hexahydrate)
Magnetic susceptibility (χ)	+4005.0·10−6 cm3/mol
Refractive index (nD)	1.511 (hexahydrate) ; 1.467 (heptahydrate)
Structure
Crystal structure	orthorombic (anhydrous) ; tetragonal (hexahydrate) ; rhombohedral (heptahydrate)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302+H332, H315, H317, H334, H341, H350, H360D, H372, H410
Precautionary statements	P201, P261, P273, P280, P308+P313, P501
NFPA 704 (fire diamond)	3 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	264 mg/kg
Safety data sheet (SDS)	External MSDS
Related compounds
Other cations	Cobalt(II) sulfate; Copper(II) sulfate; Iron(II) sulfate
	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

Nickel(II) sulfate, or just nickel sulfate, usually refers to the inorganic compound with the formula NiSO₄(H₂O)₆. This highly soluble turquoise coloured salt is a common source of the Ni²⁺ ion for electroplating. Approximately 40,000 tonnes were produced in 2005.