Mercury(II) bromide
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| Names | |
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IUPAC name
Mercury(II) bromide
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| Other names
Mercuric bromide
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| Identifiers | |
| ECHA InfoCard | 100.029.245 |
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PubChem CID
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| RTECS number | OV7415000 |
| 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 | |
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EU classification (DSD) (outdated)
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 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| R-phrases (outdated) | R26/27/28, R33, R50/53 |
| S-phrases (outdated) | (S1/2), S13, S28, S45, S60, S61 |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 | |
| Flash point | Non-flammable |
| Related compounds | |
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Other anions
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Mercury(II) fluoride Mercury(II) chloride Mercury(II) iodide |
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Other cations
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Zinc bromide Cadmium bromide Mercury(I) bromide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| 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.
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.
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:
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.
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