Mercury(II) bromide

Mercury(II) bromide or mercuric bromide is an inorganic compound with the formula HgBr2.[2] This white solid is a laboratory reagent.[3] [2] Like all mercury salts, it is highly toxic.[2]

Mercury(II) bromide
Mercury(II) bromide
Names
IUPAC name
Mercury(II) bromide
Other names
Mercuric bromide
Identifiers
ECHA InfoCard 100.029.245
RTECS number
  • OV7415000
UNII
Properties
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)
0.6 g/100 mL (25°C)
Solubility 30 g/100 mL (25°C) ethanol
−94.2·10−6 cm3/mol
Structure
rhombic
Hazards
GHS labelling:[1]
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H300, H310, H330, H373, H410
P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P304+P340, P310, P314, P320, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
3
0
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

Preparation

Mercury(II) bromide can be produced by reaction of metallic mercury with bromine.[4]

Reactions

Mercury(II) bromide is used as a reagent in the Koenigs–Knorr reaction, which forms glycoside linkages on carbohydrates.[5][6]

It is also used to test for the presence of arsenic, as recommended by the Pharmacopoeia.[7] The arsenic in the sample is first converted to arsine gas by treatment with hydrogen. Arsine reacts with mercury(II) bromide:[8]

AsH3 + 3HgBr2 → As(HgBr)3 + 3HBr

The white mercury(II) bromide will turn yellow, brown, or black if arsenic is present in the sample.[9]

Mercury(II) bromide reacts violently with elemental indium at high temperatures[10] and, when exposed to potassium, can form shock-sensitive explosive mixtures.[11]

References
  1. "Mercuric bromide". PubChem. National Center for Biotechnology Information. Retrieved 2021-11-25.
  2. PubChem. "Mercury bromide (Hg2Br2)". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-12-22.
  3. Elements, American. "Mercury Bromide". American Elements. Retrieved 2022-12-22.
  4. F. Wagenknecht; R. Juza (1963). "Mercury(II) bromide". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY, NY: Academic Press. p. 1109.
  5. Horton, Derek (2004), Advances in Carbohydrate Chemistry and Biochemistry, Amsterdam: Elseveir Academic Press, p. 76, ISBN 0-12-007259-9, retrieved 2008-05-29
  6. Stick, Robert V. (2001), Carbohydrates: The Sweet Molecules of Life, San Diego: Academic Press, p. 125, ISBN 0-12-670960-2, retrieved 2008-05-29
  7. Pederson, Ole (2006), Pharmaceutical Chemical Analysis, Boca Raton, Florida: CRC Press, p. 107, ISBN 0-8493-1978-1, retrieved 2008-05-29
  8. Odegaard, Nancy; Sadongei, Alyce (2005), Old Poisons, New Problems, Rowman Altamira, p. 58, ISBN 0-7591-0515-4, retrieved 2008-05-29
  9. Townsend, Timothy G.; Solo-Gabriele, Helena (2006), Environmental Impacts of Treated Wood, Boca Raton, Florida: CRC Press, p. 339, ISBN 0-8493-6495-7, retrieved 2008-05-29
  10. Bretherick, L.; Urben, P. G.; Pitt, Martin John (1999), Bretherick's Handbook of Reactive Chemical Hazards, Elseveir Academic Press, p. 110, ISBN 0-7506-3605-X
  11. Bretherick, L.; Urben, P. G.; Pitt, Martin John (1999), Bretherick's Handbook of Reactive Chemical Hazards, Elseveir Academic Press, p. 1276, ISBN 0-7506-3605-X
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