Potassium hydrogenoxalate

Potassium hydrogenoxalate
Names
IUPAC name
Potassium 2-hydroxy-2-oxoacetate
Other names
Potassium bioxalate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.004.431
UNII
  • InChI=1S/C2H2O4.K/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+1/p-1 N
    Key: JMTCDHVHZSGGJA-UHFFFAOYSA-M N
  • InChI=1/C2H2O4.K/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+1/p-1
    Key: JMTCDHVHZSGGJA-REWHXWOFAF
  • [K+].[O-]C(=O)C(=O)O
Properties
C2HKO4
Molar mass 128.124 g·mol−1
Appearance White crystalline solid
Odor odorless
Density 2.0 g/cm3
2.5 g/100 g
Solubility slightly soluble in alcohol
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

Potassium hydrogenoxalate is a salt with formula KHC2O4 or K+·HO2C-CO2−. It is one of the most common salts of the hydrogenoxalate anion, and can be obtained by reacting potassium hydroxide with oxalic acid in 1:1 mole ratio.

The salt is also known as: potassium hydrogen oxalate, potassium bioxalate, acid potassium oxalate, or monobasic potassium oxalate. In older literature, it was also called: Salt of sorrel, sorrel salt, sel d'oseille, sal acetosella; or, inaccurately, salt of lemon (due to the similar acidic “lemony” taste of the edible common sorrel or garden sorrel)

Potassium hydrogenoxalate occurs in some plants, notably sorrel. It is a commercial product used in photography, marble grinding, and removing ink stains.

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