Solid phase
Official name
Magnesium(II) chloride dihydrate
Secondary names
Magnesium dichloride dihydrate; Magnesium dichloride--water (1/2); MgCl2.2H2O
CAS number
19098-17-0
Type
Family
ionic solid
Class
normal salt
Compound type
chloride
Chemical composition
Formula
Mg2+.Cl2−∙2(H2O)
Chemical formula
MgCl2.2(H2O)
Elemental formula
(Mg2+) (Cl-)2 H4 O2
Isotope mixture type
terrestrial abundance
10.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
Mg2+ Magnesium(II) cation element 1 0.2 1 constituent cation main
Cl− Chloride anion element 2 0.4 1 constituent anion main
H2O Water molecule 2 0.4 1 hydration main
Chemical functions
  Function Number
R−OH 2
Chemical bonds
  Bond Number
⋅Mg2+⋅Cl− 2
−O…H− 4
−O−H 2
Class
normal salts (07)
Type
hydrated simple normal salts (07.04)
Phase type
crystalline
Comments
Crystal structure: distorted CdI2 structure - Coordination geometry: octahedral
Molar mass
131.24 g/mol
Density
2.51 g/cm3
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid anhydrous MgCl2
Pure color
blue-green
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