Mercury (II) bromide

Structural formula
General
Surname	Mercury (II) bromide
other names	Mercury dibromide
Molecular formula	HgBr 2
Brief description	white, odorless solid
External identifiers / databases
CAS number 7789-47-1 EC number 232-169-3 ECHA InfoCard 100.029.245 PubChem 24612 Wikidata Q172925
properties
Molar mass	360.41 g mol −1
Physical state	firmly
density	6.05 g cm −3 (25 ° C)
Melting point	238 ° C
boiling point	319 ° C
Vapor pressure	3 h Pa (150 ° C)
solubility	poor in water (6 g l −1 at 25 ° C) very soluble in DMSO (900 g l −1 at 25 ° C)
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 300-310-330-373-410 P: 260-280-301 + 310 + 330-302 + 352-310-304 + 340 + 310-403 + 233
MAK	0.1 mg m −3
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Mercury (II) bromide is a chemical compound from the group of bromides and mercury halides .

Extraction and presentation

Mercury bromide can be prepared directly from the elements in the presence of water or by reaction of mercury (I) bromide with mercury:

${\displaystyle \mathrm {Hg+Br_{2}\longrightarrow HgBr_{2}} }$

properties

Mercuric bromide is used as a reagent in the Koenigs-Knorr method used, for the synthetic preparation of glycosides of monosaccharides - derivatives is used.

It is also used to detect arsenic , which is first converted into arsine in the sample by reacting with hydrogen and then reacting with the mercury bromide:

${\displaystyle \mathrm {AsH_{3}+HgBr_{2}\longrightarrow As(HgBr_{3})+HBr} }$

The white mercury bromide turns yellow, brown or black if arsenic is present in the sample.

safety instructions

Mercury bromide is very toxic and harmful to the environment. It reacts violently, sometimes explosively, with potassium and sodium .

Individual evidence

1. ↑ ^{a b c} Data sheet Mercury (II) bromide (PDF) from Merck , accessed on June 15, 2017.
2. ↑ ^{a b c d e f g h} Entry on mercury (II) bromide in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
3. ↑ Dimethyl Sulfoxide (DMSO) Solubility Data. Gaylord Chemical Company, LLC; Bulletin 102, June 2014, p. 14. (PDF)
4. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling falls under the group entry inorganic compounds of mercury with the exception of mercuric sulphide and those specified elsewhere in this Annex in the Classification and Labeling Inventory of European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
5. ↑ Methodicum Chimicum: Preparation of Transition Metal Derivatives, ISBN 0-124-60708-X
6. ↑ mercury . In: Heinrich August Pierer , Julius Löbe (Hrsg.): Universal Lexicon of the Present and the Past . 4th edition. tape 13 . Altenburg 1861, p. 747-754 ( zeno.org ).
7. ↑ Derek Horton: Advances in Carbohydrate Chemistry and Biochemistry . 2004, ISBN 0-120-07259-9 .
8. ^ Robert V. Stick: Carbohydrates: The Sweet Molecules of Life . 2001, ISBN 0-126-70960-2 .
9. ^ Ole Pederson: Pharmaceutical Chemical Analysis . 2006, ISBN 0-849-31978-1 .
10. ↑ arsenic test (PDF; 39 kB)
11. ↑ Nancy Odegaard, Alyce Sadongei: Old Poisons, New problem. 2005, ISBN 0-759-10515-4 .
12. ↑ Timothy G. Townsend, Helena Solo-Gabriele: Environmental Impacts of Treated Wood. 2006, ISBN 0-849-36495-7 .