Barium iodate

Crystal structure
	__ Ba 2+ __ I 5+ __ O 2−
Crystal system	monoclinic
Space group	C 2 / c (No. 15)
Lattice parameters	a = 13.638 (9) Å, b = 7.979 (2) Å, c = 9.036 (6) Å, β = 133.62 (4) °
General
Surname	Barium iodate
Ratio formula	Ba (IO 3 ) 2
Brief description	white crystals
External identifiers / databases
ECHA InfoCard	100.031.035
PubChem	165892
Wikidata	Q808221
properties
Molar mass	487.13 g · mol -1 (neat); 515.15 g mol −1 (monohydrate);
Physical state	firmly
density	5.23 g cm −3 (pure substance); 4.998 g cm −3 (monohydrate);
Melting point	476 ° C (decomposition)
solubility	very bad in water (0.4 g l −1 at 25 ° C); practically insoluble in ethanol ;
safety instructions
H and P phrases	H: 272-302-332
	P: 221-264-301 + 330 + 331-371 + 380 + 375
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Barium iodate is the barium salt of iodic acid .

Manufacturing

Barium iodate can be made by boiling an aqueous solution of barium chloride with potassium iodate . The synthesis is similar to that of strontium iodate , but there the reaction mixture does not have to be boiled.

{\ displaystyle {\ ce {BaCl2 + 2KIO3 -> Ba (IO3) 2 + 2KCl}}}

properties

Physical Properties

Barium iodate crystallizes as the monohydrate Ba (IO ₃ ) ₂ · H ₂ O in the monoclinic crystal system . The crystals give off their water of crystallization at 130 ° C and are isomorphic with the crystals of barium chlorate and barium bromate . It is sparingly soluble in water, the solubility increases with increasing temperature. The solubility is greater in acids. A hexahydrate has also been described.

The solubility of the monohydrate at 25 ° C 2.7 x 10 ^-9 mol ³ / l ³ .

Chemical properties

When heated, it decomposes with the development of oxygen - and iodine , a double salt remains:

{\ displaystyle {\ ce {5Ba (IO3) 2 -> BaI2.4BaO3 + 4I2 ^ + 9O2 ^}}}

If barium iodate is mixed with dilute sulfuric acid , barium sulfate precipitates and iodic acid is released:

{\ displaystyle {\ ce {Ba (IO3) 2 + H2SO4 -> BaSO4 v + 2HIO3}}}

Individual evidence

^ Václav Petříček, Karel Malý, Bohumil Kratochvíl, Jana Podlahová, Josef Loub: Barium diiodate . In: Acta Crystallographica Section B . B36, 1980, p. 2130-2132 , doi : 10.1107 / S0567740880008102 .
↑ ^a ^b ^c ^d ^e data sheet Barium iodate monohydrate from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .
↑ ^a ^b ^c ^d Dale L. Perry, Sidney L. Phillips (Eds.): Handbook of inorganic compounds. CRC Press, Boca Raton FL et al. 1995, ISBN 0-8493-8671-3 , p. 51 ( limited preview in Google book search).
↑ ^a ^b ^c ^d ^e ^f Richard Abegg, Friedrich Auerbach: Handbook of inorganic chemistry in four volumes. Volume 2, Division 2: The elements of the second group of the periodic table. S. Hirzel, Leipzig 1905, p. 270 ( full text ).
^ ^A ^b Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Elsevier Science & Technology Books, Amsterdam 2012, ISBN 978-0-444-59550-8 ( limited preview in Google book search).

[Kristallstruktur-1] Václav Petříček, Karel Malý, Bohumil Kratochvíl, Jana Podlahová, Josef Loub: Barium diiodate . In: Acta Crystallographica Section B . B36, 1980, p. 2130-2132 , doi : 10.1107 / S0567740880008102 .

[Alfa-2] ↑ ^a ^b ^c ^d ^e data sheet Barium iodate monohydrate from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .

[Perry-3] Dale L. Perry, Sidney L. Phillips (Eds.): Handbook of inorganic compounds. CRC Press, Boca Raton FL et al. 1995, ISBN 0-8493-8671-3 , p. 51 ( limited preview in Google book search).

[Abegg-4] ↑ ^a ^b ^c ^d ^e ^f Richard Abegg, Friedrich Auerbach: Handbook of inorganic chemistry in four volumes. Volume 2, Division 2: The elements of the second group of the periodic table. S. Hirzel, Leipzig 1905, p. 270 ( full text ).

[Ropp-5] A ^b Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Elsevier Science & Technology Books, Amsterdam 2012, ISBN 978-0-444-59550-8 ( limited preview in Google book search).