Calcium nitrate

Calcium nitrate
Names
	Other names Kalksalpeter, Norgessalpeter, nitrocalcite, Norwegian salpeter, lime nitrate
Identifiers
CAS Number	10124-37-5 ; 13477-34-4 (tetrahydrate) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:64205;
ChEMBL	ChEMBL3183960;
ChemSpider	23336 ;
ECHA InfoCard	100.030.289
EC Number	233-332-1;
PubChem CID	24963;
RTECS number	EW2985000;
UNII	NF52F38N1N ; O8T8H4NBBR (tetrahydrate) ;
UN number	1454
CompTox Dashboard (EPA)	DTXSID1039719 ;
	InChI InChI=1S/Ca.2NO3/c;22-1(3)4/q+2;2-1 Key: ZCCIPPOKBCJFDN-UHFFFAOYSA-N ; InChI=1/Ca.2NO3/c;22-1(3)4/q+2;2-1 Key: ZCCIPPOKBCJFDN-UHFFFAOYAF;
	SMILES [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O;
Properties
Chemical formula	Ca(NO3)2
Molar mass	164.088 g/mol (anhydrous) ; 236.15 g/mol (tetrahydrate)
Appearance	colorless solid ; hygroscopic
Density	2.504 g/cm3 (anhydrous); 1.896 g/cm3 (tetrahydrate)
Melting point	561 °C (1,042 °F; 834 K) (anhydrous); 42.7 °C (109 °F; 316 K) (tetrahydrate)
Boiling point	decomposes (anhydrous) ; 132 °C (270 °F; 405 K) (tetrahydrate)
Solubility in water	anhydrous: ; 1212 g/L (20 °C) ; 2710 g/L (40 °C) tetrahydrate: ; 1050 g/L (0 °C) ; 1290 g/L (20 °C) ; 3630 g/L (100 °C)
Solubility	soluble in ammonia ; almost insoluble in nitric acid
Solubility in ethanol	51.4 g/100 g (20 °C); 62.9 g/100 g (40 °C)
Solubility in methanol	134 g/100 g (10 °C); 144 g/100 g (40 °C); 158 g/100 g (60 °C)
Solubility in acetone	33.08 g/100g (anhydrous, 25 °C)
Acidity (pKa)	6.0
Magnetic susceptibility (χ)	-45.9·10−6 cm3/mol
Structure
Crystal structure	cubic (anhydrous); monoclinic (tetrahydrate)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H302, H315, H319
Precautionary statements	P210, P220, P221, P264, P270, P280, P301+P312, P302+P352, P305+P351+P338, P310, P321, P330, P332+P313, P337+P313, P362, P370+P378, P501
NFPA 704 (fire diamond)	2 0 1 OX
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	302 mg/kg (rat, oral)
Safety data sheet (SDS)	ICSC 1037
Related compounds
Other anions	Calcium sulfate; Calcium chloride
Other cations	Magnesium nitrate; Strontium nitrate; Barium 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

Calcium nitrate, also called Norgessalpeter or Norwegian salpeter, is an inorganic compound with the formula Ca(NO₃)₂(H₂O)_x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate. Both anhydrous and hydrated forms are colourless salts. Calcium nitrate is mainly used as a component in fertilizers, but it has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of double salts are known including calcium ammonium nitrate decahydrate (NH₄NO₃·5Ca(NO₃)₂·10H₂O) and calcium potassium nitrate (Ca(NO₃)₂·4KNO₃).

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