Ammonium bromate

Chemical compound From Wikipedia, the free encyclopedia

Ammonium bromate is a chemical compound with the chemical formula NH4BrO3.[1]

Quick facts Identifiers, Properties ...
Ammonium bromate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.137 Edit this at Wikidata
EC Number
  • 237-566-5
UNII
  • InChI=1S/BrHO3.H3N/c2-1(3)4;/h(H,2,3,4);1H3
    Key: BEOODBYKENEKIC-UHFFFAOYSA-N
  • [NH4+].[O-]Br(=O)=O
Properties
BrH4NO3
Molar mass 145.940 g·mol−1
Density g/cm3
soluble
Hazards
GHS labelling:
GHS01: ExplosiveGHS07: Exclamation mark
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis

Ammonium bromate can be made by draining cold solutions of ammonium chloride and sodium bromate:

NH4Cl + NaBrO3 → NH4BrO3 + NaCl

Physical properties

Ammonium bromate forms colorless crystals, soluble in water, but poorly soluble in ethanol.[2][3]

It is highly explosive.

Chemical properties

Ammonium bromate is a very unstable compound that slowly decomposes at −5 °C and explodes at 54 °C. The decomposition proceeds as follows:[4][5]

NH4BrO3 → NH4NO3 + 2 Br2 + O2 + N2O + 6 H2O
NH4BrO3 → N2 + Br2 + O2 + 4 H2O

It also decomposes significantly when stored in a desiccator containing calcium chloride, changing color to yellow and then reddish brown.

References

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