Magnesium iodide

Magnesium iodide

Names
IUPAC name Magnesium iodide
Identifiers
CAS Number	10377-58-9 (anhydrous) Y 75535-11-4 (hexahydrate) N 7790-31-0 (octahydrate) Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	59700 N
ECHA InfoCard	100.030.738
EC Number	233-825-1
PubChem CID	66322
UNII	W74QE3H320 (anhydrous) Y 72I5H6SWMT (octahydrate) Y
CompTox Dashboard (EPA)	DTXSID6065056
InChI InChI=1S/2HI.Mg/h2*1H;/q;;+2/p-2 N Key: BLQJIBCZHWBKSL-UHFFFAOYSA-L N InChI=1/2HI.Mg/h2*1H;/q;;+2/p-2 Key: BLQJIBCZHWBKSL-NUQVWONBAV
SMILES I[Mg]I [Mg+2].[I-].[I-]
Properties
Chemical formula	MgI2 (anhydrous) MgI2·6H2O (hexahydrate) MgI2·8H2O (octahydrate)[1]
Molar mass	278.1139 g/mol (anhydrous) 386.2005 g/mol (hexahydrate) 422.236 g/mol (octahydrate)
Appearance	white crystalline solid
Odor	odorless
Density	4.43 g/cm3 (anhydrous solid) 2.353 g/cm3 (hexahydrate solid) 2.098 g/cm3 (octahydrate solid)
Melting point	637 °C (1,179 °F; 910 K) (anhydrous, decomposes) 41 °C (octahydrate, decomposes)
Solubility in water	54.7 g/(100 cm3) (anhydrous, 0 °C) 148 g/(100 cm3) (anhydrous, 18 °C)[2] 81 g/(100 cm3) (octahydrate, 20 °C)
Solubility	soluble in ether, alcohol and ammonia
Magnetic susceptibility (χ)	−111.0·10−6 cm3/mol
Structure
Crystal structure	Hexagonal (anhydrous) Monoclinic (hexahydrate) Orthorhombic (octahydrate)
Thermochemistry
Heat capacity (C)	74 J/(mol·K)
Std molar entropy (S⦵298)	134 J/(mol·K)
Std enthalpy of formation (ΔfH⦵298)	−364 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319
NFPA 704 (fire diamond)	3 1 1 COR
Related compounds
Other anions	Magnesium fluoride Magnesium bromide Magnesium chloride
Other cations	Beryllium iodide Calcium iodide Strontium iodide Barium iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Magnesium iodide is an inorganic compound with the chemical formula MgI₂. It forms various hydrates MgI₂·xH₂O. Magnesium iodide is a salt of magnesium and hydrogen iodide. These salts are typical ionic halides, being highly soluble in water.