Manganese(II) hydroxide

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Manganese(II) hydroxide
Other names
Manganese dihydroxide, manganese hydroxide, Manganous hydroxide
ECHA InfoCard 100.126.826
Molar mass 88.95 g·mol−1
Appearance white solid
Density 3.258 g/cm3
Melting point decomposes
0.00034 g/100 mL at 18 °C.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Manganese(II) hydroxide is the inorganic compound with the formula Mn(OH)2. It is a white solid although samples darken quickly upon exposure to air owing to oxidation. It is poorly soluble in water.

Preparation and reactions[edit]

Manganese(II) hydroxide precipitates as a solid when an alkali metal hydroxide is added to an aqueous solution of Mn2+ salt:[2]

Mn2+ + 2 NaOH → Mn(OH)2 + 2 Na+

Manganese(II) hydroxide oxidizes readily in air, as indicated by darkening of samples.

The compound adopts the brucite structure, as do several other metal dihydroxides.


  1. ^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3. 
  2. ^ H. Lux "Manganese(II) Hydroxide" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1456.