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
$Mg^{2+}.Cl^-_2 \bullet 2(H_2O)$
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
$Mg^{2+}$ Magnesium(II) cation element 1 0.2 1 constituent cation main
$Cl^-$ Chloride anion element 2 0.4 1 constituent anion main
$H_2O$ Water molecule 2 0.4 1 hydration main
Chemical functions
  Function Number
$R-OH$ 2
Chemical bonds
  Bond Number
$\cdot Mg^{2+} \cdot Cl^-$ 2
$-O \dots H-$ 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 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid anhydrous $MgCl_2$
Pure color
blue-green
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