Sodium oxalate

Sodium oxalate
Names
	Preferred IUPAC name Disodium oxalate
	Other names Oxalic acid, disodium salt; Sodium ethanedioate
Identifiers
CAS Number	62-76-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:132764 ;
ChEMBL	ChEMBL182928 ;
ChemSpider	5895 ;
ECHA InfoCard	100.000.501
EC Number	200-550-3;
PubChem CID	6125;
RTECS number	K11750000;
UNII	7U0V68LT9X ;
CompTox Dashboard (EPA)	DTXSID1037018 ;
	InChI InChI=1S/C2H2O4.2Na/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);;/q;2*+1/p-2 Key: ZNCPFRVNHGOPAG-UHFFFAOYSA-L ;
	SMILES C(=O)(C(=O)[O-])[O-].[Na+].[Na+];
Properties
Chemical formula	Na2C2O4
Molar mass	133.998 g·mol−1
Appearance	White crystalline solid
Odor	Odorless
Density	2.34 g/cm3
Melting point	260 °C (500 °F; 533 K) decomposes above 290 °C
Solubility in water	2.69 g/(100 mL) (0 °C); 3.7 g/(100 mL) (20 °C); 6.25 g/(100 mL) (100 °C);
Solubility	Soluble in formic acid, insoluble in ethanol, diethyl ether
Structure
Crystal structure	monoclinic
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−1318 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312
Precautionary statements	P280, P301+P312, P302+P352
NFPA 704 (fire diamond)	1 0 0
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	11160 mg/kg (oral, rat)
Safety data sheet (SDS)	Oxford MSDS
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium oxalate, or disodium oxalate, is a chemical compound with the chemical formula Na₂C₂O₄. It is the sodium salt of oxalic acid. It contains sodium cations Na⁺ and oxalate anions C₂O2−4. It is a white, crystalline, odorless solid, that decomposes above 290 °C.

Sodium oxalate can act as a reducing agent, and it may be used as a primary standard for standardizing potassium permanganate (KMnO₄) solutions.

The mineral form of sodium oxalate is natroxalate. It is only very rarely found and restricted to extremely sodic conditions of ultra-alkaline pegmatites.

Names

Preferred IUPAC name Disodium oxalate
Other names Oxalic acid, disodium salt Sodium ethanedioate
Identifiers
CAS Number	62-76-0^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:132764^N
ChEMBL	ChEMBL182928^N
ChemSpider	5895^N
ECHA InfoCard	100.000.501
EC Number	200-550-3
PubChem CID	6125
RTECS number	K11750000
UNII	7U0V68LT9X^Y
CompTox Dashboard (EPA)	DTXSID1037018
InChI InChI=1S/C2H2O4.2Na/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);;/q;2*+1/p-2^N Key: ZNCPFRVNHGOPAG-UHFFFAOYSA-L^N
SMILES C(=O)(C(=O)[O-])[O-].[Na+].[Na+]
Properties
Chemical formula	Na₂C₂O₄
Molar mass	133.998 g·mol⁻¹
Appearance	White crystalline solid
Odor	Odorless
Density	2.34 g/cm³
Melting point	260 °C (500 °F; 533 K) decomposes above 290 °C
Solubility in water	2.69 g/(100 mL) (0 °C) 3.7 g/(100 mL) (20 °C) 6.25 g/(100 mL) (100 °C)
Solubility	Soluble in formic acid, insoluble in ethanol, diethyl ether
Structure
Crystal structure	monoclinic
Thermochemistry
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−1318 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312
Precautionary statements	P280, P301+P312, P302+P352
NFPA 704 (fire diamond)	1 0 0
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	11160 mg/kg (oral, rat)
Safety data sheet (SDS)	Oxford MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references