Nickel(II) chloride

Nickel chloride
	Hexahydrate
	Anhydrous
Names
	IUPAC name Nickel(II) chloride
	Other names Nickelous chloride, nickel(II) salt of hydrochloric acid
Identifiers
CAS Number	7718-54-9 ; 7791-20-0 (hexahydrate) ;
3D model (JSmol)	anhydrous: Interactive image; hexahydrate: Interactive image;
ChEBI	CHEBI:34887 ;
ChemSpider	22796 ;
ECHA InfoCard	100.028.858
EC Number	231-743-0;
KEGG	C14711 ;
PubChem CID	24385;
RTECS number	QR6480000;
UNII	696BNE976J ; T8365BUD85 (hexahydrate) ;
UN number	3288 3077
CompTox Dashboard (EPA)	DTXSID7040316 ;
	InChI InChI=1S/2ClH.Ni/h21H;/q;;+2/p-2 Key: QMMRZOWCJAIUJA-UHFFFAOYSA-L ; InChI=1/2ClH.Ni/h21H;/q;;+2/p-2 Key: QMMRZOWCJAIUJA-NUQVWONBAR;
	SMILES anhydrous: [Ni+2].[Cl-].[Cl-]; hexahydrate: Cl[Ni-4](Cl)([OH2+])([OH2+])([OH2+])[OH2+].O.O;
Properties
Chemical formula	NiCl2
Molar mass	129.5994 g/mol (anhydrous) ; 237.69 g/mol (hexahydrate)
Appearance	yellow-brown crystals ; deliquescent (anhydrous) ; green crystals (hexahydrate)
Odor	odorless
Density	3.55 g/cm3 (anhydrous) ; 1.92 g/cm3 (hexahydrate)
Melting point	1,001 °C (1,834 °F; 1,274 K) (anhydrous) ; 140 °C (hexahydrate)
Solubility in water	anhydrous ; 67.5 g/100 mL (25 °C) ; 87.6 g/100 mL (100 °C) hexahydrate ; 282.5 g/100 mL (25 °C) ; 578.5 g/100 mL (100 °C)
Solubility	0.8 g/100 mL (hydrazine) ; soluble in ethylene glycol, ethanol, ammonium hydroxide ; insoluble in ammonia, nitric acid
Acidity (pKa)	4 (hexahydrate)
Magnetic susceptibility (χ)	+6145.0·10−6 cm3/mol
Structure
Crystal structure	Monoclinic
Coordination geometry	octahedral at Ni
Thermochemistry
Std molar; entropy (S⦵298)	107 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−316 kJ·mol−1
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Very toxic (T+); Irritant (Xi); Dangerous for the environment (N); Carcinogen
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H315, H317, H331, H334, H341, H350i, H360D, H372, H410
Precautionary statements	P201, P202, P260, P261, P264, P270, P271, P272, P273, P280, P281, P285, P301+P310, P302+P352, P304+P340, P304+P341, P308+P313, P311, P314, P321, P330, P332+P313, P333+P313, P342+P311, P362, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	105 mg/kg (rat, oral)
Safety data sheet (SDS)	Fischer Scientific
Related compounds
Other anions	Nickel(II) fluoride; Nickel(II) bromide; Nickel(II) iodide
Other cations	Palladium(II) chloride; Platinum(II) chloride; Platinum(II,IV) chloride; Platinum(IV) chloride
Related compounds	Cobalt(II) chloride; Copper(II) chloride
	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) chloride (or just nickel chloride) is the chemical compound NiCl₂. The anhydrous salt is yellow, but the more familiar hydrate NiCl₂·6H₂O is green. Nickel(II) chloride, in various forms, is the most important source of nickel for chemical synthesis. The nickel chlorides are deliquescent, absorbing moisture from the air to form a solution. Nickel salts have been shown to be carcinogenic to the lungs and nasal passages in cases of long-term inhalation exposure.