Manganese(II) chloride tetrahydrate (MnCl2•4H2O)-Crystalline

Characteristic

Manganese(II) chloride is the dichloride salt of manganese, MnCl₂. This inorganic chemical exists in the anhydrous form, as well as the dihydrate (MnCl₂·2H2O) and tetrahydrate MnCl₂·4H₂O), with the tetrahydrate being the most common form.

Chemical formula：MnCl₂·4H₂O

Molar mass：125.844 g/mol (anhydrous);161.874 g/mol (dihydrate);197.91 g/mol (tetrahydrate)

Appearance：pink solid (tetrahydrate)

Density：2.977 g/cm³ (anhydrous);2.27 g/cm³ (dihydrate);2.01 g/cm³ (tetrahydrate)

Melting point：654 °C (1,209 °F; 927 K) (anhydrous);dihydrate dehydrates at 135 °C

tetrahydrate dehydrates at 58 °C

Boiling point：1,225 °C (2,237 °F; 1,498 K)

Solubility in water：63.4 g/100 ml (0 °C);73.9 g/100 ml (20 °C);88.5 g/100 ml (40 °C);123.8 g/100 ml (100 °C)

Solubility：slightly soluble in pyridine,soluble in ethanol;insoluble in ether

Magnetic susceptibility (χ):+14,350·10⁻⁶ cm³/mol

Application

Manganese chloride is used as a source of manganese ion in biological research, such as in studies of manganese uptake in rat liver. It has been substituted for magnesium chloride to investigate alterations in activity of the Herpes simplex virus type 1 DNA polymerase. It is also used in industrial applications such as dyeing and disinfecting, the purification of natural gas, and as a drying agent for linseed oil.