Ammonium bromate

Ammonium bromate
Identifiers
CAS Number	13843-59-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	55594;
ECHA InfoCard	100.034.137
EC Number	237-566-5;
PubChem CID	61691;
UNII	237-566-5;
CompTox Dashboard (EPA)	DTXSID00160678;
	InChI InChI=1S/BrHO3.H3N/c2-1(3)4;/h(H,2,3,4);1H3 Key: BEOODBYKENEKIC-UHFFFAOYSA-N;
	SMILES [NH4+].[O-]Br(=O)=O;
Properties
Chemical formula	BrH4NO3
Molar mass	145.940 g·mol−1
Density	g/cm3
Solubility in water	soluble
Hazards
	GHS labelling:
Pictograms
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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

Synthesis

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

NH₄Cl + NaBrO₃ → NH₄BrO₃ + NaCl

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

It is highly explosive.

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.

^ Urben, Peter (18 March 2017). Bretherick's Handbook of Reactive Chemical Hazards. Elsevier. p. 1328. ISBN 978-0-08-101059-4. Retrieved 30 January 2025.
^ Watts, Henry (1866). A Dictionary of Chemistry and the Allied Branches of Other Sciences: Abichite. Longmans, Green, and Company. p. 670. Retrieved 30 January 2025.
^ Haynes, William M. (22 June 2016). CRC Handbook of Chemistry and Physics. CRC Press. p. 4-46. ISBN 978-1-4987-5429-3. Retrieved 30 January 2025.
^ Solymosi, Frigyes; Bansagi, Tamas (1 January 1970). "Stability of ammonium halates in the solid state. Kinetics and mechanism of the thermal decomposition of ammonium bromate". The Journal of Physical Chemistry. 74 (1): 15–21. doi:10.1021/j100696a003. ISSN 0022-3654. Retrieved 30 January 2025.
^ Galwey, A. K.; Brown, M. E. (25 February 1999). Thermal Decomposition of Ionic Solids: Chemical Properties and Reactivities of Ionic Crystalline Phases. Elsevier. p. 423. ISBN 978-0-08-054279-9. Retrieved 30 January 2025.