Calcium nitrate
Other names	Kalksalpeter, nitrocalcite, Norwegian saltpeter, lime nitrate
Identifiers
CAS number	10124-37-5
PubChem	24963
RTECS number	EW2985000
SMILES	[Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O
InChI InChI=1/Ca.2NO3/c;2*2-1(3)4/q+2;2*-1
Properties
Molecular 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, 834 K, 1042 °F
Boiling point
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	16.8 g/kg (20 °C)
Acidity (pKa)	6.0
Magnetic susceptibility (χ)	-45.9·10−6 cm3/mol
Structure
Crystal structure	cubic (anhydrous) monoclinic (tetrahydrate)
Hazards
NFPA 704	0 2 1
R-phrases	R22, R41
Flash point	Non-flammable
Related compounds
Other anions	Calcium sulfate Calcium chloride
Other cations	Magnesium nitrate Strontium nitrate Barium nitrate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Calcium nitrate, also known as Norwegian saltpeter, is a chemical compound. Its chemical formula is Ca(NO₃)₂. It contains calcium and nitrate ions.