Barium iodate
Crystal structure | ||||||||||
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__ Ba 2+ __ I 5+ __ O 2− | ||||||||||
Crystal system |
monoclinic |
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Space group |
C 2 / c (No. 15) |
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Lattice parameters |
a = 13.638 (9) Å, b = 7.979 (2) Å, c = 9.036 (6) Å, β = 133.62 (4) ° |
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General | ||||||||||
Surname | Barium iodate | |||||||||
Ratio formula | Ba (IO 3 ) 2 | |||||||||
Brief description |
white crystals |
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properties | ||||||||||
Molar mass | ||||||||||
Physical state |
firmly |
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density |
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Melting point |
476 ° C (decomposition) |
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solubility |
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safety instructions | ||||||||||
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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.
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:
If barium iodate is mixed with dilute sulfuric acid , barium sulfate precipitates and iodic acid is released:
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).