Sodium oxalate

Sodium oxalate
Disodium oxalate
Names
Preferred IUPAC name
Disodium oxalate
Other names
Oxalic acid, disodium salt
Sodium ethanedioate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.000.501 Edit this at Wikidata
EC Number
  • 200-550-3
RTECS number
  • K11750000
UNII
  • 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
  • C(=O)(C(=O)[O-])[O-].[Na+].[Na+]
Properties
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[2]
  • 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
monoclinic
Thermochemistry
−1318 kJ/mol
Hazards
GHS labelling:[3]
GHS07: Exclamation mark
Warning
H302, H312
P280, P301+P312, P302+P352
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
0
0
Lethal dose or concentration (LD, LC):
11160 mg/kg (oral, rat)[1]
Safety data sheet (SDS) Oxford MSDS [unreliable source]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.[2]

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.[4]

  1. ^ a b "ChemIDplus - 62-76-0 - ZNCPFRVNHGOPAG-UHFFFAOYSA-L - Disodium oxalate - Similar structures search, synonyms, formulas, resource links, and other chemical information". chem.nlm.nih.gov. NIH. Retrieved 7 January 2019.
  2. ^ a b Cite error: The named reference yoshi was invoked but never defined (see the help page).
  3. ^ GHS: GESTIS 570199
  4. ^ "Natroxolate" (PDF). RRUFF. Mineral Data Publishing. Retrieved 7 January 2019.