Mercury(II) bromide
| Mercury(II) bromide | ||
|---|---|---|
 | ||
| IUPAC name Mercury(II) bromide | ||
| Other names Mercuric bromide | ||
| Identifiers | ||
| CAS number | 7789-47-1  | |
| PubChem | 24612 | |
| RTECS number | OV7415000 | |
| Properties | ||
| Molecular 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 | soluble | |
| Solubility | very slightly soluble in ether | |
| Structure | ||
| Coordination geometry |
rhombic | |
| Hazards | ||
| EU Index | 080-002-00-6 | |
| EU classification | Very toxic (T+) Dangerous for the environment (N) | |
| R-phrases | R26/27/28, R33, R50/53 | |
| S-phrases | (S1/2), S13, S28, S45, S60, S61 | |
| NFPA 704 |
 0
3
0
| |
| 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 | |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| Infobox references | ||
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.
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.
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]
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]
References
- ↑ Horton, Derek (2004), Advances in Carbohydrate Chemistry and Biochemistry, Amsterdam: Elseveir Academic Press, p. 76, ISBN 0-12-007259-9, retrieved 2008-05-29
- ↑ 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
- ↑ Pederson, Ole (2006), Pharmaceutical Chemical Analysis, Boca Raton, FL: CRC Press, p. 107, ISBN 0-8493-1978-1, retrieved 2008-05-29
- ↑ Odegaard, Nancy; Sadongei, Alyce (2005), Old Poisons, New Problems, Rowman Altamira, p. 58, ISBN 0-7591-0515-4, retrieved 2008-05-29
- ↑ Townsend, Timothy G.; Solo-Gabriele, Helena (2006), Environmental Impacts of Treated Wood, Boca Raton, FL: CRC Press, p. 339, ISBN 0-8493-6495-7, retrieved 2008-05-29
- ↑ 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, retrieved 2008-05-29
- ↑ 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, retrieved 2008-05-29
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