Mercury(II) bromide

Mercury(II) bromide or mercuric bromide is the chemical compound composed of mercury and bromine with the formula HgBr2. This white crystalline solid is a laboratory reagent. Like mercury(II) chloride, it is extremely toxic.

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)
soluble
Solubility very slightly soluble in ether
−94.2·10−6 cm3/mol
Structure
rhombic
Hazards
T+ (T+)
N (N)
R-phrases (outdated) R26/27/28, R33, R50/53
S-phrases (outdated) (S1/2), S13, S28, S45, S60, S61
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid
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).
N verify (what is YN ?)
Infobox references

Preparation

Mercury(II) bromide can be manufactured by: adding potassium bromide to a solution of mercuric salt and crystallizing; by precipitation using a mercury(II) nitrate and sodium bromide solution; by dissolving mercury(II) oxide in hydrobromic acid. Also, Mercury(II) bromide can be created by reacting mercury with bromine.

Reactions

Mercury(II) bromide is used as a reagent in the Koenigs–Knorr reaction, which forms glycoside linkages on carbohydrates.[1][2]

It is also used to test for the presence of arsenic, as recommended by the Pharmacopoeia.[3] The arsenic in the sample is first converted to arsine gas by treatment with hydrogen. Arsine reacts with mercury(II) bromide:[4]

AsH3 + 3HgBr2 → As(HgBr)3 + 3HBr

The white mercury(II) bromide will turn yellow, brown, or black if arsenic is present in the sample.[5]

Mercury(II) bromide reacts violently with elemental indium at high temperatures[6] and, when exposed to potassium, can form shock-sensitive explosive mixtures.[7]

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References
  1. Horton, Derek (2004), Advances in Carbohydrate Chemistry and Biochemistry, Amsterdam: Elseveir Academic Press, p. 76, ISBN 0-12-007259-9, retrieved 2008-05-29
  2. 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
  3. Pederson, Ole (2006), Pharmaceutical Chemical Analysis, Boca Raton, Florida: CRC Press, p. 107, ISBN 0-8493-1978-1, retrieved 2008-05-29
  4. Odegaard, Nancy; Sadongei, Alyce (2005), Old Poisons, New Problems, Rowman Altamira, p. 58, ISBN 0-7591-0515-4, retrieved 2008-05-29
  5. 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
  6. 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
  7. 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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