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Sodium oxalate
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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]
Quick Facts Names, Identifiers ...
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Names | |
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Preferred IUPAC name
Disodium oxalate | |
Other names
Oxalic acid, disodium salt Sodium ethanedioate | |
Identifiers | |
3D model (JSmol) |
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ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.000.501 ![]() |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
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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] |
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Solubility | Soluble in formic acid, insoluble in ethanol, diethyl ether |
Structure | |
monoclinic | |
Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) |
−1318 kJ/mol |
Hazards | |
GHS labelling:[3] | |
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Warning | |
H302, H312 | |
P280, P301+P312, P302+P352 | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
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 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]