Chemistry:Mercury(II) bromide

Mercury(II) bromide

Names
IUPAC name Mercury(II) bromide
Other names Mercuric bromide
Identifiers
CAS Number	7789-47-1 Y
PubChem CID	24612
RTECS number	OV7415000
UNII	P986675T8V Y
Properties
Chemical formula	HgBr2
Molar mass	360.41 g/mol
Appearance	white solid
Density	6.03 g/cm3, solid
Melting point	237 °C (459 °F; 510 K)
Boiling point	322 °C (612 °F; 595 K)
Solubility in water	0.6 g/100 mL (25°C)
Solubility	30 g/100 mL (25°C) ethanol
Magnetic susceptibility (χ)	−94.2·10−6 cm3/mol
Structure
Coordination geometry	rhombic
Hazards
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	HH300Category:GHS errors, HH310Category:GHS errors, HH330Category:GHS errors, HH373Category:GHS errors, HH410Category:GHS errors
GHS precautionary statements	PP260Category:GHS errors, PP262Category:GHS errors, PP264Category:GHS errors, PP270Category:GHS errors, PP271Category:GHS errors, PP273Category:GHS errors, PP280Category:GHS errors, PP284Category:GHS errors, PP301+P310Category:GHS errors, PP302+P350Category:GHS errors, PP304+P340Category:GHS errors, PP310Category:GHS errors, PP314Category:GHS errors, PP320Category:GHS errors, PP321Category:GHS errors, PP322Category:GHS errors, PP330Category:GHS errors, PP361Category:GHS errors, PP363Category:GHS errors, PP391Category:GHS errors, PP403+P233Category:GHS errors, PP405Category:GHS errors, PP501Category:GHS errors
NFPA 704 (fire diamond)	0 3 2
Flash point	Non-flammable
Related compounds
Other anions	Mercury(II) fluoride Mercury(II) chloride Mercury(II) iodide
Other cations	Zinc bromide Cadmium bromide Mercury(I) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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Mercury(II) bromide or mercuric bromide is an inorganic compound with the formula HgBr₂. This white solid is a laboratory reagent. Like all mercury salts, it is highly toxic.

Preparation

Mercury(II) bromide can be produced by reaction of metallic mercury with bromine.

Reactions

Mercury(II) bromide is used as a reagent in the Koenigs–Knorr reaction, which forms glycoside linkages on carbohydrates.

It is also used to test for the presence of arsenic, as recommended by the Pharmacopoeia. The arsenic in the sample is first converted to arsine gas by treatment with hydrogen. Arsine reacts with mercury(II) bromide:

AsH₃ + 3HgBr₂ → As(HgBr)₃ + 3HBr

The white mercury(II) bromide will turn yellow, brown, or black if arsenic is present in the sample.

Mercury(II) bromide reacts violently with elemental indium at high temperatures and, when exposed to potassium, can form shock-sensitive explosive mixtures.