Oxalate

Oxalate
	The structure of the oxalate anion
Names
	IUPAC name Oxalate
	Systematic IUPAC name Ethanedioate
Identifiers
CAS Number	338-70-5 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1905970
ChEBI	CHEBI:30623;
ChemSpider	64235;
Gmelin Reference	2207
KEGG	C00209;
PubChem CID	71081;
UNII	PQ7QG47K6T ;
	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
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 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.