Sodium hydrogenoxalate

Sodium hydrogenoxalate is the sodium salt of hydrogenoxalate. The only difference from oxalic acid is that one of the two hydrogen atoms has been replaced with a sodium atom. Like oxalate, it is toxic for the kidney function if swallowed because of the precipitation of poorly soluble calcium oxalate stones that can obstruct the kidney tubules.[6]

Sodium hydrogenoxalate

Names
IUPAC name Sodium hydrogen oxalate[1]
Other names Ethanedioate, hydrogen sodium salt (1:1:1) Ethanedioic acid, sodium salt (1:1) Monosodium oxalate Sodium hydrogen ethanedioate (1:1:1) Oxalic acid sodium salt Oxalic acid, sodium salt Sodium acid oxalate Sodium and hydrogen and oxalate Sodium bioxalate[2]
Identifiers[3][4]
CAS Number	1186-49-8
3D model (JSmol)	Interactive image
ChemSpider	4953678
ECHA InfoCard	100.013.356
EC Number	214-691-3
PubChem CID	23684893
UNII	2T9TH558WS
CompTox Dashboard (EPA)	DTXSID1047499
InChI InChI=1S/C2H2O4.Na/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+1/p-1 Key: UJRAXLUXHBUNDO-UHFFFAOYSA-M
SMILES [Na+].[O-]C(=O)C(=O)O
Properties
Chemical formula	C2HNaO4
Molar mass	112.0167[5]
Hazards
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H302, H312
GHS precautionary statements	P264, P270, P280, P301+312, P302+352, P312, P322, P330, P363, P501
Related compounds
Other anions	Sodium bicarbonate (oxalate replaced with carbonate)
Other cations	Potassium hydrogenoxalate (potassium instead of sodium) Oxalic acid (hydrogen instead of sodium) Sodium oxalate (sodium instead of hydrogen)
Related compounds	Hydrogenoxalate (sodium ion removed) Hydrogenoxalate (sodium and hydrogen ions removed)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Stability

Upon being heated, sodium hydrogenoxalate undergoes cation-pairing to become oxalic acid and sodium oxalate, the latter of which decomposes into sodium carbonate and carbon monoxide.

2NaHC₂O₄ → Na₂C₂O₄ + H₂C₂O₄

Na₂C₂O₄ → Na₂CO₃ + CO[7]

References

1. "2T9TH558WS | C2HNaO4 | ChemSpider". www.chemspider.com. p. Names. Retrieved 11 September 2018. Sodium hydrogen oxalate [ACD/IUPAC Name]
2. "2T9TH558WS | NaHC2O4 | ChemSpider". www.chemspider.com. p. Names. Retrieved 11 September 2018.
3. "Monosodium oxalate". pubchem.ncbi.nlm.nih.gov. Retrieved 11 September 2018.
4. "2T9TH558WS | NaHC2O4 | ChemSpider". www.chemspider.com. p. Names. Retrieved 11 September 2018.
5. "Sodium Hydrogen Oxalate NaHC₂O₄ Molecular Weight — EndMemo". www.endmemo.com. Retrieved 11 September 2018. Molar Mass: 112.0167
6. "Monosodium oxalate". pubchem.ncbi.nlm.nih.gov. Retrieved 11 September 2018. H302 (100%): Harmful if swallowed [Warning Acute toxicity, oral] H312 (100%): Harmful in contact with skin [Warning Acute toxicity, dermal]
7. W. Balcerowiak; Cz. Latocha; J. Wasilewski (1980). "Thermoanalytical investigation of mixtures containing oxalic acid, sodium hydrogen oxalate and sodium oxalate". Journal of Thermal Analysis. 18: 57–63. doi:10.1007/BF01909453. A solid ternary system containing oxalic acid dihydrate, sodium hydrogen oxalate was subjected to thermoanalytical investigation to develop its full qualitative and quantitative analyses based on the following reactions of thermal decomposition of the individually heated compounds of this system [4-6]: H2C2O4 " 2 H2O -+ H2C2O4 + 2 H2O NaHC2O4 9 H2O -* NaHC2O4 + H2O 2 NaHC2O4 ~ Na2C2O4 + (H2C2O4) Na2C2O4 --, Na2CO3 + CO