Sodium bromate
Crystal structure | ||||||||||||||||
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__ Na + __ Br 5+ __ O 2− | ||||||||||||||||
Crystal system |
cubic |
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Space group |
P 2 1 3 (No. 198) |
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Lattice parameters |
a 6.70717 Å |
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General | ||||||||||||||||
Surname | Sodium bromate | |||||||||||||||
other names |
Sodium bromate (V) |
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Ratio formula | NaBrO 3 | |||||||||||||||
Brief description |
colorless odorless solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 150.89 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
3.34 g cm −3 |
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Melting point |
381 ° C (decomposition) |
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solubility |
Easily soluble in water (364 g l −1 at 20 ° C) |
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Refractive index |
1.6168 |
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safety instructions | ||||||||||||||||
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Toxicological data | ||||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C |
Sodium bromate is a chemical compound from the groups of sodium compounds and bromates .
Extraction and presentation
Sodium bromate can be represented by the reaction of liquid bromine with a solution of sodium hydroxide :
This leaves five molecules of NaBr and one molecule of sodium bromate (NaBrO 3 ).
Sodium bromate can also be obtained by dissolving sodium carbonate in water and then reacting it with bromine.
properties
Sodium bromate is a colorless, odorless, hygroscopic solid that is a strong oxidizing agent . It decomposes above 381 ° C, producing oxygen . It crystallizes cubically , space group P 2 1 3 (space group no. 198) , with the lattice parameter a = 6.707 Å .
The salt is very soluble in water. The solubility increases with increasing temperature.
solubility in water temperature in ° C 0 20th 40 60 80 100 solubility in g / 100 g H 2 O 27.5 36.4 48.8 62.6 75.8 90.8
use
Sodium bromate is used as an oxidizing agent (e.g. as a bleaching agent and in textile dyeing) and as a piezoelectric single crystal. In combination with sodium bromide , it is used in gold washing. In organic chemistry, sodium bromate is used as a bromination reagent for aromatic compounds such as nitrobenzene , benzoic acid and benzaldehyde .
Related links
- Sodium bromite NaBrO 2 , CAS number: 7486-26-2
- Sodium chlorate
Individual evidence
- ↑ a b S. C. Abrahams, JL Bernstein: Remeasurement of optically active NaClO 3 and NaBrO 3 . In: Acta Crystallographica . B33, 1977, pp. 3601-3604, doi: 10.1107 / S0567740877011637 .
- ↑ a b c d e f g h Entry on sodium bromate in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .
- ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Index of Refraction of Inorganic Crystals, pp. 10-247.
- ↑ Sodium bromate data sheet , ≥99% from Sigma-Aldrich , accessed on May 18, 2017 ( PDF ).
- ↑ a b c d e D. Yoffe, R. Frim, SD Ukeles, MJ Dagani, HJ Barda, TJ Benya, DC Sanders: Bromine Compounds. In: Ullmann's Encyclopedia of Technical Chemistry . Wiley-VCH Verlag, Weinheim 2013, doi : 10.1002 / 14356007.a04_405.pub2 .
- ↑ Production of bromine compounds (Weizmann) (PDF; 4.8 MB)
- ↑ a b Bromine, Inorganic Compounds (ICL) ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ A. Groweiss: Use of Sodium bromate for Aromatic Bromination: Research and Development. In: Org. Process Res. Dev. 4, 2000, pp. 30-33, doi: 10.1021 / op9901947 .