Mercury(II) hydroxide

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Mercury(II) hydroxide
IUPAC name
mercury dihydroxide
3D model (JSmol)
Molar mass 234.605
−100.00·10−6 cm3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Mercury(II) hydroxide or mercury dihydroxide is an inorganic metal hydroxide with the chemical formula HgH2O2 or more commonly written as Hg(OH)2.


It is not possible to make the chemical by adding OH to Hg2+ in aqueous solution, since this merely precipitates yellow solid HgO, although it is possible that Hg(OH)2 is momentarily produced during the reaction.[1]

The first experimental evidence for the existence of the molecule was reported by Wang and Andrews in 2004.[1] They produced it by irradiating a frozen mixture of mercury, oxygen and hydrogen with light from a mercury arc lamp. The mixture had been produced by evaporating mercury atoms at 50 °C into a gas consisting of neon, argon or deuterium (in separate experiments) plus 2 to 8% hydrogen and 0.2 to 2.0% oxygen. The mixture was then condensed at 5 kelvins onto a caesium iodide window, through which it could be irradiated.[1]


  1. ^ a b c Xuefeng Wang; Lester Andrews (November 18, 2004). "Infrared Spectrum of Hg(OH)2 in Solid Neon and Argon". Inorganic Chemistry. 44 (1): 108–11. doi:10.1021/ic048673w. PMID 15627366.