Oxalate

Oxalate

The structure of the oxalate anion
Names
IUPAC name Oxalate
Systematic IUPAC name Ethanedioate[1]
Identifiers
CAS Number	338-70-5 Y
3D model (JSmol)	Interactive image
Beilstein Reference	1905970
ChEBI	CHEBI:30623
ChemSpider	64235
Gmelin Reference	2207
KEGG	C00209
PubChem CID	71081
UNII	PQ7QG47K6T Y
InChI InChI=1S/C2H2O4/c3-1(4)2(5)6/h(H,3,4)(H,5,6)/p-2 Key: MUBZPKHOEPUJKR-UHFFFAOYSA-L InChI=1S/C2H2O4/c3-1(4)2(5)6/h(H,3,4)(H,5,6)/p-2 Key: MUBZPKHOEPUJKR-UHFFFAOYSA-L
SMILES C(=O)(C(=O)[O-])[O-]
Properties
Chemical formula	C2O2−4
Molar mass	88.018 g·mol−1
Conjugate acid	Hydrogenoxalate[2]
Structure
Point group	D2h
Related compounds
Related isoelectronic	Dinitrogen tetroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Oxalate (systematic IUPAC name: ethanedioate) is an anion with the chemical formula formula C₂O2−4. This dianion is colorless. It occurs naturally, including in some foods. It forms a variety of salts, for example sodium oxalate (Na₂C₂O₄), and several esters such as dimethyl oxalate ((CH₃)₂C₂O₄). It is a conjugate base of oxalic acid. At neutral pH in aqueous solution, oxalic acid converts completely to oxalate.