Cesium chromate

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Crystal structure
Crystal structure of cesium chromate
Crystal system

orthorhombic

Space group

Pnma (No. 62)Template: room group / 62

Lattice parameters

a = 8.43  Å , b = 6.30 Å and c = 11.20 Å

General
Surname Cesium chromate
Ratio formula Cs 2 CrO 4
Brief description

yellow, odorless solid

External identifiers / databases
CAS number 13454-78-9
EC number 236-640-4
ECHA InfoCard 100.033.296
PubChem 61613
Wikidata Q416962
properties
Molar mass 381.8 g mol −1
Physical state

firmly

density

4.24 g cm −3 (20 ° C)

solubility

good in water (714 g l −1 at 15 ° C)

safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary
03 - Oxidising 08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 272-317-350-410
P: 201-221-302 + 352-371 + 380 + 375
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 . Template: room group / 62

safety instructions

Like other chromates, cesium chromate can cause cancer .

Individual evidence

  1. ↑ a b c d e data sheet Cesium chromate, 99.9% (metals basis) from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .
  2. ^ 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).
  3. ↑ 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 .
  4. ↑ 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.
  5. ↑ 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.
  6. ^ 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.