Copper(II) nitrate

Copper(II) nitrate
alpha polymorph	beta polymorph
Names
	IUPAC name Copper(II) nitrate
	Other names Cupric nitrate
Identifiers
CAS Number	3251-23-8 ; 10031-43-3 (trihydrate) ; 13478-38-1 (hexahydrate) ; 19004-19-4 (hemipentahydrate) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:78036 ;
ChemSpider	17582 ;
ECHA InfoCard	100.019.853
PubChem CID	18616; 9837674 (trihydrate); 9839123 (hexahydrate);
RTECS number	GL7875000;
UNII	9TC879S2ZV ; 066PG1506T (trihydrate) ; 0HP2H86BS6 (hexahydrate) ;
CompTox Dashboard (EPA)	DTXSID7040314 ;
	InChI InChI=1S/Cu.2NO3/c;22-1(3)4/q+2;2-1 Key: XTVVROIMIGLXTD-UHFFFAOYSA-N ; InChI=1/Cu.2NO3/c;22-1(3)4/q+2;2-1 Key: XTVVROIMIGLXTD-UHFFFAOYAG;
	SMILES [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O;
Properties
Chemical formula	Cu(NO3)2
Molar mass	187.5558 g/mol (anhydrous) ; 241.60 g/mol (trihydrate) ; 232.591 g/mol (hemipentahydrate)
Appearance	blue-green crystals (anhydrous); blue crystals (hydrate)
Density	3.05 g/cm3 (anhydrous) ; 2.32 g/cm3 (trihydrate) ; 2.07 g/cm3 (hexahydrate)
Melting point	114 °C (237 °F; 387 K) (anhydrous, decomposes) ; 114.5 °C (trihydrate) ; 26.4 °C (hexahydrate, decomposes)
Boiling point	170 °C (338 °F; 443 K) (trihydrate, decomposes)
Solubility in water	trihydrate: ; 381 g/100 mL (40 °C) ; 666 g/100 mL (80 °C); hexahydrate: ; 243.7 g/100 mL (80 °C)
Solubility	hydrates very soluble in ethanol, ammonia, water; insoluble in ethyl acetate
Magnetic susceptibility (χ)	+1570.0·10−6 cm3/mol (~3H2O)
Structure
Crystal structure	orthorhombic (anhydrous) ; rhombohedral (hydrates)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Irritant, Oxidizer
NFPA 704 (fire diamond)	1 0 3 OX
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Safety data sheet (SDS)	Cu(NO3)2·3H2O
Related compounds
Other anions	Copper(II) sulfate; Copper(II) chloride
Other cations	Silver nitrate; Gold(III) nitrate
	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

Copper(II) nitrate describes any member of the family of inorganic compounds with the formula Cu(NO₃)₂(H₂O)_x. The hydrates are hygroscopic blue solids. Anhydrous copper nitrate forms blue-green crystals and sublimes in a vacuum at 150-200 °C. Common hydrates are the hemipentahydrate and trihydrate.