Mercury(I) oxide

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Mercury(I) oxide
Identifiers
3D model (JSmol)
ChemSpider
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EC Number
  • 239-934-0
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UNII
UN number 1641
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  • InChI=1S/2Hg.O checkY
    Key: RPZHFKHTXCZXQV-UHFFFAOYSA-N checkY[1]
  • O([Hg])[Hg]
  • [O-2].[Hg+].[Hg+]
Properties
Hg2O
Molar mass 417.183 g·mol−1
Appearance Very dark, orange, opaque crystals
Odor Odourless
Density 9.8 g mL−1
−76.3·10−6 cm3/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 highly toxic
GHS labelling:[3]
GHS07: Exclamation markGHS08: Health hazard
Danger
H315, H317, H320, H335, H341, H361, H370, H372
P201, P202, P260, P261, P264, P270, P271, P272, P280, P281, P302+P352, P304+P340, P305+P351+P338, P307+P311, P308+P313, P312, P314, P321, P332+P313, P333+P313, P337+P313, P362, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)

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4
0
1
Lethal dose or concentration (LD, LC):
18 mg/kg (oral, rat)[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Mercury(I) oxide, also known as mercurous oxide, is an inorganic metal oxide with the chemical formula Hg2O.

It is a brown/black powder, insoluble in water but soluble in nitric acid. With hydrochloric acid, it reacts to form calomel, Hg2Cl2.[4] Mercury(I) oxide is toxic but without taste or smell. It is chemically unstable and converts to mercury(II) oxide and mercury metal.

References

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