Hypobromous acid
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| General | |||||||||||||||||||
| Surname | Hypobromous acid | ||||||||||||||||||
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| Molecular formula | HBrO | ||||||||||||||||||
| Brief description |
weakly dissociated acid which is stable only in solution |
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| properties | |||||||||||||||||||
| Molar mass | 96.91 g mol −1 | ||||||||||||||||||
| pK s value |
7.69 |
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| solubility |
soluble in water |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
As hypobromous acid , also outdated hypobromous acid , which is oxygen acid of bromine in the oxidation state +1 indicated by the empirical formula HBrO. It is only stable in solution and cannot be kept pure. Their salts and esters are called hypobromites .
Extraction and presentation
Hypobromous acid is obtained by the disproportionation of molecular bromine in water.
In order to shift the equilibrium, which is on the left side, in the desired direction, the resulting hydrogen bromide is intercepted with an excess of mercury (II) oxide :
- HgBr 2 and HgO together form mercury oxide bromide HgBr 2 · 2 HgO.
The resulting solution of hypobromous acid can only be enriched up to a content of 6%.
properties
Hypobromous acid, like its salts, forms yellow-colored solutions with an aromatic odor. The acid and its salts are unstable and tend to disproportionate in hydrobromic acid and bromic acid or in bromide and bromate . Production and storage must therefore take place at 0 ° C.
It is a weak acid and a powerful oxidizer . In an acidic solution, the normal potential for the HBrO / Br pair is - +1.34 V.
use
Due to their oxidizing properties, hypobromite solutions are used as bleaching agents and disinfectants . The best results are achieved when it is used in combination with the homologous hypochlorous acid .
Individual evidence
- ↑ a b c d e f g A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 .
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ Entry on hypobromous acid. In: Römpp Online . Georg Thieme Verlag, accessed on June 18, 2014.
Web links
- Lecture notes on bromine and bromine compounds (PDF file; 85 kB)