Chromium (II) oxalate

Structural formula
General
Surname	Chromium (II) oxalate
Molecular formula	CrC 2 O 4
Brief description	yellowish green solid
External identifiers / databases
CAS number 814-90-4 EC number 212-410-9 ECHA InfoCard 100.011.282 PubChem 13147 Wikidata Q5113816
properties
Molar mass	140.015 g mol −1
Physical state	firmly
density	2.468 g cm −3 (monohydrate)
solubility	sparingly soluble in water and ethanol
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromium (II) oxalate is a chemical compound of chromium from the group of oxalates , which is normally in the form of a hydrate .

Extraction and presentation

Chromium (II) oxalate can be obtained by reacting chromium (II) sulfate with sodium oxalate .

${\displaystyle \mathrm {CrSO_{4}\cdot 5H_{2}O+Na_{2}C_{2}O_{4}\longrightarrow CrC_{2}O_{4}\cdot H_{2}O+Na_{2}SO_{4}+4\ H_{2}O} }$

properties

Chromium (II) oxalate is a yellowish green powder that is sparingly soluble in water and ethanol and, when dry, is fairly resistant to atmospheric oxygen. Drying over phosphorus pentoxide gives the salt almost anhydrous as a light green powder. Complete dehydration is only possible at 300 ° C. in a high vacuum, although partial decomposition occurs.

Individual evidence

1. ↑ ^{a b c d e} 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. 1512.
2. ^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1461-9 , pp. 121 ( limited preview in Google Book search).
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.