Cesium chromate
Crystal structure | ||||||||||||||||
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Crystal system |
orthorhombic |
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Space group |
Pnma (No. 62) |
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Lattice parameters |
a = 8.43 Å , b = 6.30 Å and c = 11.20 Å |
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General | ||||||||||||||||
Surname | Cesium chromate | |||||||||||||||
Ratio formula | Cs 2 CrO 4 | |||||||||||||||
Brief description |
yellow, odorless solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 381.8 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
4.24 g cm −3 (20 ° C) |
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solubility |
good in water (714 g l −1 at 15 ° C) |
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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 . |
Cesium chromate is a chemical compound from the chromate group . It is the cesium salt of chromic acid . The compound is a poisonous, yellow powder.
Extraction and presentation
Cesium chromate can be obtained by reacting cesium carbonate with chromium (VI) oxide .
It is also possible to display it by reacting cesium dichromate with barium hydroxide .
properties
Cesium chromate crystallizes in the orthorhombic crystal system in the space group Pnma (space group no. 62) with the lattice parameters a = 8.43 Å , b = 6.30 Å and c = 11.20 Å, as well as four formula units per unit cell .
safety instructions
Like other chromates, cesium chromate can cause cancer .
Individual evidence
- ↑ a b c d e data sheet Cesium chromate, 99.9% (metals basis) from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .
- ^ A b Dale L. Perry: Handbook of Inorganic Compounds . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 111 ( limited preview in Google Book search).
- ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry Chromium (VI) compounds, with the exception of barium chromate and of compounds 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 .
- ↑ IV Vinarov, IB Fraiman, SA kolach: Complex preparation of reactive pure cesium salts from cesium chloride . In: Khimicheskaya Tekhnologiya (Kharkov) . 1966, 6, pp. 98-102.
- ↑ Georg Brauer (ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1525.
- ^ Alan J. Morris, Colin HL Kennard, Frank H. Moore, Graham Smith, Henry Montgomery: Cesium chromate, CrCs 2 O 4 [by neutron diffraction] . In: Crystal Structure Communications . 1981, 2, 10, pp. 529-32.