Manganese(II) hydroxide

Manganese(II) hydroxide
Names
	Other names Manganese dihydroxide, manganese hydroxide, Manganous hydroxide
Identifiers
CAS Number	18933-05-6;
ECHA InfoCard	100.126.826
Properties
Chemical formula	H2MnO2
Molar mass	88.95 g·mol−1
Appearance	white solid
Density	3.258 g/cm3
Melting point	decomposes
Solubility in water	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

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.

References

↑ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
↑ 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.

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[1] Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.

[brauer-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.