Copper oxalate

Copper oxalate is an inorganic compound, a salt of copper metal and oxalic acid with the chemical formula CuC
2O
4.[3] The compound is practically insoluble in water, alcohol, ether, and acetic acid but soluble in ammonium hydroxide.[4] Copper oxalate forms a hydrate, which forms acid-blue crystals.

Copper oxalate
Names
Other names
Copper (II) oxalate, cupric oxalate, copper(2+) ethanedioate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.011.283
EC Number
  • 212-411-4
UNII
UN number 3077
  • Key: QYCVHILLJSYYBD-UHFFFAOYSA-N
  • InChI=1S/C2H2O4.Cu/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+2
  • C(=O)(C(=O)O)O.[Cu+2]
Properties
CuC
2O
4
Molar mass 153.58
Appearance blue-white solid (as a hemihydrate)
Melting point 310 °C (590 °F; 583 K)
insoluble
4.43×10−10[1]
Hazards
GHS labelling:
GHS07: Exclamation mark[2]
Warning
H302, H302+H312, H312
P264, P270, P280, P301+P312, P302+P352, P312, P322, P330, P363, P501
Related compounds
Related compounds
 Calcium oxalate
Sodium oxalate
Magnesium oxalate
Strontium oxalate
Barium oxalate
Iron(II) oxalate
Iron(III) oxalate
Lithium oxalate
Praseodymium oxalate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

Copper 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.[5]

Properties

As a hemihydrate, copper oxalate is a blue-white solid that is practically insoluble in water. At 200 °C, it loses its water due to crystallization.

The compound also forms complex salts with alkali metal oxalates and ammonium oxalate:

Uses

Copper oxalate is used as a catalyst for organic reactions, as a stabilizer for acetylated polyformaldehyde[6] and in seed treatment (to repel birds and rodents).

See also

References
  1. John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
  2. "Copper oxalate - Substance Information - ECHA". European Chemical Agency. Retrieved 17 June 2021.
  3. Royappa, A. Timothy; Royappa, Andrew D.; Moral, Raphael F.; Rheingold, Arnold L.; Papoular, Robert J.; Blum, Deke M.; Duong, Tien Q.; Stepherson, Jacob R.; Vu, Oliver D.; Chen, Banghao; Suchomel, Matthew R.; Golen, James A.; André, Gilles; Kourkoumelis, Nikolaos; Mercer, Andrew D.; Pekarek, Allegra M.; Kelly, Dylan C. (November 2016). "Copper(I) oxalate complexes: Synthesis, structures and surprises". Polyhedron. 119: 563–574. doi:10.1016/j.poly.2016.09.043.
  4. "Hazardous Substances Data Bank (HSDB) : 265". National Library of Medicine. Retrieved 17 June 2021.
  5. Gooch, Frank Austin (1909). The precipitation of copper oxalate in analysis. p. 448. OCLC 890741677.
  6. Richardson, H. Wayne (1997). Handbook of Copper Compounds and Applications. CRC Press. p. 84. ISBN 978-0-8247-8998-5.
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