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	NH4BrO3
Molar mass	145.940 g·mol−1
Appearance	colorless hexagonal crystals
Melting point	Explodes
Solubility in water	soluble
	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.

Synthesis

Ammonium bromate can be prepared by combining aqueous solutions of ammonium chloride and sodium bromate. The product precipitates out upon cooling and can be collected by filtration:

NH₄Cl + NaBrO₃ → NH₄BrO₃ + NaCl

Physical properties

Ammonium bromate forms colorless crystals, soluble in water, but poorly soluble in ethanol.^[2]^[1]

It is a severe explosion hazard.^[3]

Chemical properties

Ammonium bromate is a very unstable compound that slowly decomposes at −3 °C (27 °F; 270 K):^[4]

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

If heated to 54 °C (129 °F; 327 K) (or randomly when stored at room temperature) it explodes, leaving no solid residues:^[4]

2 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

1 2 Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). Boca Raton, Florida: CRC Press. pp. 4–46. ISBN 9781498754293.
↑ 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.
↑ Sax, N. Irving (1957). Dangerous Properties of Industrial Materials. New York: Reinhold. p. 275. OL 6226647M.
1 2 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.

[CRC97-1] 1 2 Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). Boca Raton, Florida: CRC Press. pp. 4–46. ISBN 9781498754293.

[2] 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.

[Sax57-3] Sax, N. Irving (1957). Dangerous Properties of Industrial Materials. New York: Reinhold. p. 275. OL 6226647M.

[Decomp-4] 1 2 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.

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