Mercury(I) oxide

Mercury(I) oxide
Identifiers
CAS Number	15829-53-5 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	17615579 ;
ECHA InfoCard	100.036.289
EC Number	239-934-0;
PubChem CID	16683011;
UNII	0I308SWC92 ;
UN number	1641
CompTox Dashboard (EPA)	DTXSID3065954 ;
	InChI InChI=1S/2Hg.O Key: RPZHFKHTXCZXQV-UHFFFAOYSA-N ;
	SMILES O([Hg])[Hg]; [O-2].[Hg+].[Hg+];
Properties
Chemical formula	Hg2O
Molar mass	417.183 g·mol−1
Appearance	Very dark, orange, opaque crystals
Odor	Odourless
Density	9.8 g mL−1
Magnetic susceptibility (χ)	−76.3·10−6 cm3/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	highly toxic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H315, H317, H320, H335, H341, H361, H370, H372
Precautionary statements	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)	4 0 1
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	18 mg/kg (oral, rat)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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. Mercury(I) oxide is toxic but without taste or smell. It is chemically unstable and converts to mercury(II) oxide and mercury metal.

Identifiers
CAS Number	15829-53-5^Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	17615579^Y
ECHA InfoCard	100.036.289
EC Number	239-934-0
PubChem CID	16683011
UNII	0I308SWC92^Y
UN number	1641
CompTox Dashboard (EPA)	DTXSID3065954
InChI InChI=1S/2Hg.O^Y Key: RPZHFKHTXCZXQV-UHFFFAOYSA-N^Y
SMILES O([Hg])[Hg] [O-2].[Hg+].[Hg+]
Properties
Chemical formula	Hg₂O
Molar mass	417.183 g·mol⁻¹
Appearance	Very dark, orange, opaque crystals
Odor	Odourless
Density	9.8 g mL⁻¹
Magnetic susceptibility (χ)	−76.3·10⁻⁶ cm³/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	highly toxic
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H315, H317, H320, H335, H341, H361, H370, H372
Precautionary statements	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)	4 0 1
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	18 mg/kg (oral, rat)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references