Manganese (II) hydroxide

Crystal structure
	__ Mn 2+ __ OH -
General
Surname	Manganese (II) hydroxide
Ratio formula	Mn (OH) 2
Brief description	white to pink solid
External identifiers / databases
EC number	606-171-3
ECHA InfoCard	100.126.826
PubChem	73965
ChemSpider	66594
Wikidata	Q4138103
properties
Molar mass	88.95 g mol −1
Physical state	firmly
density	3.258 g cm −3
solubility	practically insoluble in water (19 mg l −1 at 18 ° C); soluble in concentrated alkalis and acids ;
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Manganese (II) hydroxide is an inorganic chemical compound of manganese from the group of hydroxides .

Extraction and presentation

Manganese (II) hydroxide precipitates out of the solution as a yellowish precipitate in the reaction of manganese (II) salt solutions with alkali solutions in the absence of air. For example, by reacting manganese (II) chloride tetrahydrate with a potassium hydroxide solution.

{\ displaystyle \ mathrm {MnCl_ {2} \ cdot 4H_ {2} O + 2 \ KOH \ longrightarrow Mn (OH) _ {2} +2 \ KCl + 4 \ H_ {2} O}}

properties

Precipitation of manganese (II) hydroxide with partial oxidation to brown manganese (III) or manganese (IV) oxide hydroxide by atmospheric oxygen

Manganese (II) hydroxide is a white to pink solid that is practically insoluble in water. It is stable when it is free from alkali hydroxides and amorphous components. Otherwise it quickly turns brown in air (formation of manganese (III) and manganese (IV) oxide hydrates ). It has a hexagonal crystal structure isotype to that of cadmium hydroxide with the space group P 3 m 1 (space group no.164) (a = 334 pm, c = 468 pm). However, it also occurs in an orthorhombic modification with the space group Pbnm (No. 62, position 3) . Template: room group / 164Template: room group / 62.3

Individual evidence

↑ ^a ^b ^c ^d Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 264 ( limited preview in Google Book search).
↑ ^a ^b ^c Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1581.
↑ ^a ^b ^c Roger Blachnik (Ed.): Pocket book for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. 4th, revised and revised edition. Springer, Berlin 1998, ISBN 3-540-60035-3 , pp. 568 ( limited preview in Google Book search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1484.

[Dale_L._Perry-1] Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 264 ( limited preview in Google Book search).

[brauer-2] Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1581.

[Lax-3] Roger Blachnik (Ed.): Pocket book for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. 4th, revised and revised edition. Springer, Berlin 1998, ISBN 3-540-60035-3 , pp. 568 ( limited preview in Google Book search).

[NV-4] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Arnold_F._Holleman,_Egon_Wiberg,_Nils_Wiberg-5] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1484.