Manganese (II) chloride
|__ Mn 2+ __ Cl -|
|Surname||Manganese (II) chloride|
white to light purple (anhydrous) or pale pink (tetrahydrate), odorless solid
|External identifiers / databases|
1190 ° C
in water: * 723 g l −1 (anhydrous, 20 ° C) * 1200 g l −1 (dihydrate, 20 ° C) * 1980 g l −1 (tetrahydrate, 20 ° C)
0.5 mg m −3
|As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .|
Manganese (II) chloride is a pale pink-red powder. The compound consists of manganese and chlorine and is usually present as a tetrahydrate or in anhydrous form.
Extraction and presentation
Manganese (II) chloride tetrahydrate can be produced by reacting manganese , manganese (II) carbonate or manganese dioxide with concentrated hydrochloric acid:
The anhydrous MnCl 2 can be obtained from the tetrahydrate on heating in a stream of dry hydrogen chloride .
Manganese (II) chloride forms pale pink hygroscopic crystals. It is very soluble in water and ethanol . In solution, the color is due to the hexaquamanganese (II) cation, [Mn (H 2 O) 6 ] 2+ . The tetrahydrate is in the form of an octahedral complex in which the two chloride ligands are in the cis position. With an excess of chloride ions, the complex anions MnCl 4 2− (tetrachloromanganate (II), tetrahedral ) or MnCl 6 4− (hexachloromanganate (II), octahedral) are formed.
Manganese (II) chloride is used to produce manganese brown Mn (O) OH and as a starting material for the synthesis of manganese-containing catalysts .