Manganese(II) chloride
- MnCl2 (anhydrous)
- MnCl2 · 2 H2O (dihydrate )
- MnCl2 · 4 H2O (tetrahydrate )
- 7773-01-5 (anhydrous)
- 13446-34-9 (tetrahydrate )
White to light purple (anhydrous) or pale pink (tetrahydrate ), odorless solid
Fixed
- 2.98 g · cm -3 ( 25 ° C, anhydrous)
- 2.27 g · cm -3 (20 ° C, dihydrate)
- 2.01 g · cm -3 (20 ° C, tetrahydrate)
- 650 ° C ( anhydrous)
- 58 ° C ( tetrahydrate)
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)
Risk
0.5 mg · m-3
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Manganese (II ) chloride is a pale pink- red powder. The connection consists of manganese and chlorine and is usually present as tetrahydrate or in anhydrous form.
Production and representation
Manganese ( II) chloride tetrahydrate can be produced by the reaction of manganese, manganese (II ) carbonate or manganese dioxide with concentrated hydrochloric acid:
When heated in dry hydrogen chloride stream can be obtained from the tetrahydrate, anhydrous MnCl2.
Properties
Manganese (II ) chloride forms pale pink deliquescent crystals. It is very soluble in water and ethanol. In solution, the ink on the Hexaaquamangan ( II) cation, [Mn (H2O ) 6] 2 is due. The tetrahydrate is in the form of an octahedral complex in which two chloride ligands are cis. With an excess of chloride ions to form the complex anions MnCl42 ( tetrachloromanganate (II ), tetrahedral ) or MnCl64 ( Hexachloromanganat (II ), octahedral).
Use
Manganese ( II) chloride, manganese -containing catalysts used for the production of brown manganese Mn ( O) OH, and as a starting material for the synthesis.