Magnesium nitrate

Magnesium nitrate

Names
IUPAC name Magnesium nitrate
Other names Nitromagnesite (hexahydrate)
Identifiers
CAS Number	10377-60-3 Y 15750-45-5 (dihydrate) N 13446-18-9 (hexahydrate) N
3D model (Jmol)	Interactive image
ChEBI	CHEBI:64736 N
ChemSpider	23415 N
ECHA InfoCard	100.030.739
EC Number	233-826-7
PubChem CID	25212
RTECS number	OM3750000 (anhydrous) OM3756000 (hexahydrate)
UNII	77CBG3UN78 N
UN number	1474
InChI InChI=1S/Mg.2NO3/c;2*2-1(3)4/q+2;2*-1 N Key: YIXJRHPUWRPCBB-UHFFFAOYSA-N N InChI=1/Mg.2NO3/c;2*2-1(3)4/q+2;2*-1 Key: YIXJRHPUWRPCBB-UHFFFAOYAA
SMILES [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[Mg+2]
Properties
Chemical formula	Mg(NO3)2
Molar mass	148.32 g/mol (anhydrous) 184.35 g/mol (dihydrate) 256.41 g/mol (hexahydr.)
Appearance	White crystalline solid
Density	2.3 g/cm3 (anhydrous) 2.0256 g/cm3 (dihydrate) 1.464 g/cm3 (hexahydrate)
Melting point	129 °C (264 °F; 402 K) (dihydrate) 88.9 °C (hexahydrate)
Boiling point	330 °C (626 °F; 603 K) decomposes
Solubility in water	125 g/100 mL
Solubility	moderately soluble in ethanol, ammonia
Refractive index (nD)	1.34 (hexahydrate)
Structure
Crystal structure	cubic
Thermochemistry
Specific heat capacity (C)	141.9 J/mol K
Std molar entropy (So298)	164 J/mol K
Std enthalpy of formation (ΔfHo298)	-790.7 kJ/mol
Gibbs free energy (ΔfG˚)	-589.4 kJ/mol
Hazards
Main hazards	Irritant
Safety data sheet	External MSDS
R-phrases (outdated)	R8, R36, R37, R38
S-phrases (outdated)	S17, S26, S36
NFPA 704	0 1 0 OX
Flash point	Non-flammable
Related compounds
Other anions	Magnesium sulfate Magnesium chloride
Other cations	Beryllium nitrate Calcium 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).
N  (what is YN ?)
Infobox references

Magnesium nitrate is a hygroscopic salt with the formula Mg(NO₃)₂. In air, it quickly forms the hexahydrate with the formula Mg(NO₃)₂·6H₂O (and molar weight of 256.41 g/mol). It is very soluble in both water and ethanol.

Magnesium nitrate occurs in mines and caverns as nitromagnesite (hexahydrate form). This form is not common, although it may be present where guano contacts magnesium-rich rock. It is used in the ceramics, printing, chemical and agriculture industries. Its fertilizer grade has 10.5% nitrogen and 9.4% magnesium, so it is listed as 10.5-0-0 + 9.4% Mg. Fertilizer blends containing magnesium nitrate usually have ammonium nitrate, calcium nitrate, potassium nitrate and micronutrients; these blends are used in the greenhouse and hydroponics trade.

The magnesium nitrate used in commerce is a man-made product. It can be synthesized in a variety of ways. The reaction between nitric acid and magnesium metal

or magnesium oxide