Copper (II) oxalate

Structural formula
General
Surname	Copper (II) oxalate
Molecular formula	CuC 2 O 4
Brief description	blue-white solid
External identifiers / databases
CAS number 814-91-5 55671-32-4 ( hydrate ) 5893-66-3 (deleted, originally for hemihydrate ) EC number 212-411-4 ECHA InfoCard 100.011.283 PubChem 13148 Wikidata Q4332771
properties
Molar mass	151.57 g mol −1
Physical state	firmly
Melting point	310 ° C
solubility	practically insoluble in water, ether and ethanol soluble in ammonia water
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 312-302 P: 280-301 + 312-312-363-322-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Copper (II) oxalate is a chemical compound of copper from the group of carboxylic acid salts .

Extraction and presentation

Copper (II) oxalate can be produced by precipitation from a mixture of a copper (II) salt and a sodium oxalate solution or by reacting copper sulfate with oxalic acid .

${\displaystyle \mathrm {CuSO_{4}+H_{2}C_{2}O_{4}+H_{2}O\longrightarrow {}\ CuC_{2}O_{4}\cdot H_{2}O\downarrow +H_{2}SO_{4}} }$

properties

Copper (II) oxalate as a Hemi hydrate a blue-white solid which is practically insoluble in water. At 200 ° C this loses its water of crystallization.

use

Copper (II) oxalate is used as a catalyst for organic reactions, as a stabilizer for acetylated polyformaldehyde and in seed treatment (to repel birds and rodents).

Individual evidence

1. ↑ ^{a b c d e} Entry for CAS no. 814-91-5 in the GESTIS substance database of the IFA , accessed on October 18, 2014(JavaScript required) .
2. ↑ ^{a b c d e f} Entry on copper (II) oxalate in the Hazardous Substances Data Bank , accessed on October 18, 2014.
3. ↑ Data sheet Copper (II) oxalate hemihydrate, 98% from AlfaAesar, accessed on October 18, 2014 ( PDF )(JavaScript required) .