Barium bromate

Crystal structure
	__ Ba 2+ __ Br 5+ __ O 2−
Crystal system	monoclinic
Space group	C 2 / c (No. 15)
Lattice parameters	a = 1332 pm , b = 790 pm, c = 858 pm, β = 134.2 °
General
Surname	Barium bromate
Ratio formula	Ba (BrO 3 ) 2
Brief description	colorless and odorless solid
External identifiers / databases
EC number	237-750-5
ECHA InfoCard	100.034.304
PubChem	61706
Wikidata	Q808214
properties
Molar mass	393.13 g · mol -1 (anhydrous); 411.15 g mol −1 (monohydrate);
Physical state	firmly
density	3.99 g cm −3 (monohydrate)
Melting point	260 ° C (decomposition)
solubility	7.88 g l −1 at 25 ° C (anhydrous); insoluble in ethanol ;
safety instructions
H and P phrases	H: 272-302-332
	P: 210-221-264-280-301 + 330 + 331-304 + 340-312-371 + 380 + 375
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Barium bromate is the barium salt of bromic acid with the chemical composition Ba (BrO ₃ ) ₂ .

Manufacturing

Barium bromate can be made by boiling an aqueous solution of barium chloride or barium acetate with potassium bromate .

{\ displaystyle {\ ce {BaCl2 + 2KBrO3 -> Ba (BrO3) 2 + 2KCl}}}

{\ displaystyle {\ ce {(CH3COO) 2Ba + 2KBrO3 -> Ba (BrO3) 2 + 2CH3COOK}}}

properties

Barium bromate crystallizes isomorphically to α- barium iodate in the monoclinic crystal system in the space group C 2 / c (space group no.15) with the lattice parameters a = 1332 pm , b = 790 pm, c = 858 pm and β = 134.2 ° as well as four Formula units in the unit cell . The solubility in water increases with increasing temperature: 2.86 g of barium bromate dissolve in 1 liter of water at 0 ° C., 7.88 g at 25 ° C. and 53.9 g at 99.65 ° C. Barium bromate usually occurs as the monohydrate Ba (BrO ₃ ) ₂ · H ₂ O, which gives off its water of crystallization at 190 ° C. This also crystallizes monoclinically, space group I 2 / c (No. 15, position 6) , lattice parameters a = 907.0 pm, b = 789.5 pm, c = 963.0 pm and β = 93.26 °. A dihydrate is also known (monoclinic, space group C 2 / c (No. 15) , lattice parameters a = 1043 pm, b = 719.5 pm, c = 837.5 pm, β = 113.6 °). Template: room group / 15 Template: room group / 15.6Template: room group / 15

When heated to 265 ° C, barium bromate breaks down into barium bromide and oxygen .

{\ displaystyle {\ ce {Ba (BrO3) 2 -> BaBr2 + 3O2 ^}}}

The enthalpy of solution is +54 kJ / mol, the solubility product is 2.43 · 10 ⁻⁴ mol ³ / l ³ .

use

Barium bromate is used as an oxidizing agent and as a corrosion inhibitor .

Individual evidence

↑ ^a ^b H. D. Lutz, E. Alici, T. Kellersohn, P. Kuske: On the polymorphism of Ba (BrO ₃ ) ₂ and Sr (IO ₃ ) ₂ , crystal structure, X-ray, vibrational spectroscopic and thermoanalytical investigations. In: Journal of Nature Research B . 45, 1990, pp. 587-592 ( PDF , free full text).
↑ ^a ^b ^c Entry on barium bromate in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
↑ ^a ^b ^c ^d ^e ^f Dale L. Perry, Sidney L. Phillips: Handbook of inorganic compounds . CRC Press, 1995, ISBN 978-0-8493-8671-8 , p. 47 ( limited preview in Google book search).
↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling it falls under the group entry barium salts, with the exception of barium sulphate, salts of 1-azo-2-hydroxynaphthalenyl aryl sulphonic acid, and of salts specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
↑ ^a ^b Leopold Gmelin, K. List: Handbuch der inorganic Chemie , Volume 2, 1853, S. 146. ( limited preview in the Google book search)
↑ ^a ^b R. Abegg, F. Auerbach: "Handbuch der inorganic Chemie". Verlag S. Hirzel, Vol. 2, 1908. P. 270. Full text
↑ ^a ^b ^c Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 94 ( limited preview in Google Book search).
^ LK Templeton, DH Templeton: Structure of barium bromate monohydrate. In: Acta Crystallographica , C45, 1989, pp. 672-673, doi: 10.1107 / S0108270188013071 .
^ HD Lutz, B. Engelen, C. Freiburg: Barium bromide dihydrate. In: Acta Crystallographica , B36, 1980, pp. 437-438, doi: 10.1107 / S0567740880003421 .

[Lutz-1] H. D. Lutz, E. Alici, T. Kellersohn, P. Kuske: On the polymorphism of Ba (BrO ₃ ) ₂ and Sr (IO ₃ ) ₂ , crystal structure, X-ray, vibrational spectroscopic and thermoanalytical investigations. In: Journal of Nature Research B . 45, 1990, pp. 587-592 ( PDF , free full text).

[GESTIS-2] Entry on barium bromate in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .

[Perry-3] ↑ ^a ^b ^c ^d ^e ^f Dale L. Perry, Sidney L. Phillips: Handbook of inorganic compounds . CRC Press, 1995, ISBN 978-0-8493-8671-8 , p. 47 ( limited preview in Google book search).

[CLP_100.240.782-4] Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling it falls under the group entry barium salts, with the exception of barium sulphate, salts of 1-azo-2-hydroxynaphthalenyl aryl sulphonic acid, and of salts specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[Gmelin-5] Leopold Gmelin, K. List: Handbuch der inorganic Chemie , Volume 2, 1853, S. 146. ( limited preview in the Google book search)

[Abegg-6] R. Abegg, F. Auerbach: "Handbuch der inorganic Chemie". Verlag S. Hirzel, Vol. 2, 1908. P. 270. Full text

[Ropp-7] Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 94 ( limited preview in Google Book search).

[8] LK Templeton, DH Templeton: Structure of barium bromate monohydrate. In: Acta Crystallographica , C45, 1989, pp. 672-673, doi: 10.1107 / S0108270188013071 .

[9] HD Lutz, B. Engelen, C. Freiburg: Barium bromide dihydrate. In: Acta Crystallographica , B36, 1980, pp. 437-438, doi: 10.1107 / S0567740880003421 .