Copper(II) nitrate

Copper(II) nitrate
	Trihydrate
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); 80 °C (176 °F; 353 K) (trihydrate, decomposes); 26.4 °C (79.5 °F; 299.5 K) (hexahydrate, decomposes);
Boiling point	170 °C (338 °F; 443 K) (trihydrate, decomposes)
Solubility in water	trihydrate:; 381 g/100 mL (40 °C (104 °F; 313 K)); 666 g/100 mL (80 °C (176 °F; 353 K)); hexahydrate:; 243.7 g/100 mL (80 °C (176 °F; 353 K));
Solubility in ethanol	hydrates very soluble
Solubility in ammonia	hydrates very soluble
Magnetic susceptibility (χ)	1570.0×10−6 cm3/mol (trihydrate)
Structure
Crystal structure	orthorhombic (anhydrous); rhombohedral (hydrates);
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Irritant, Oxidizer
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H314, H410
Precautionary statements	P210, P220, P221, P260, P264, P273, P280, P301+P330+P331, P303+P361+P353, P304+P340+P310, P305+P351+P338+P310, P363, P370+P378, P391, P405, P501
NFPA 704 (fire diamond)	3 3 3 OX
	NIOSH (US health exposure limits):
PEL (Permissible)	1 mg/m3 (TWA, as Cu)
REL (Recommended)	1 mg/m3 (TWA, as Cu)
IDLH (Immediate danger)	100 mg/m3 (TWA, as Cu)
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·x(H₂O). The hydrates are hygroscopic blue solids. Anhydrous copper nitrate forms blue-green crystals and sublimes in a vacuum at 150–200 °C (302–392 °F). Common hydrates are the hemipentahydrate and trihydrate.