Magnesium Chloride

Molecular formula: 

MgCl2

Classification: 

salt

CAS number: 

7786-30-3

Solubility details

Magnesium Cloride is highly soluble in water. In water it dissociates to ions: a cation of magnesium (Mg2+) and two anions of cloride (Cl-)

Solubility formula: 

MgCl2 solubility Mg2+ + 2Cl-

Solubility in water: 
54.20g/L
Molar solubility: 
0.23M
Ksp: 
738
State
State at 25C and 1000 kPa: 

solid

Melting point (Celsius): 
714.00oC
Melting point (Kelvin): 
987.00K
Boiling point (Celsius): 
1412.00oC
Boiling point (Kelvin): 
1685.00K
General information
Appearence: 

white or colourless crystalline solid

Colour: 

white or colourless

Molar mass: 
95.2110g/mol
Density: 
2.3800g/cm3

The main application of magnesium chloride is production of magnesium metal. This is done by the precipitation process for which the formula is given in the common reactions section. Magnesium chloride is also used for a variety of other applications like the manufacture of textiles, paper, fireproofing agents, cements and refrigeration brine, and dust and erosion control. Also, presence of magnesium chloride in water decreases its freezing point making magnesium chloride a perfect anti-icer.

Another use of magnesium chloride is in the food industry - it is used as acoagulant in the preparation of tofu from soy milk.

Common reactions

Precipitation

MgCl2(aq) + Ca(OH)2(aq) solubility Mg(OH)2(s) + CaCl2(aq)