Potassium hydrogenoxalate
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IUPAC name Potassium 2-hydroxy-2-oxoacetate | |
Other names Potassium bioxalate | |
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ECHA InfoCard | 100.004.431 |
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InChI
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Properties | |
Chemical formula | C2HKO4 |
Molar mass | 128.124 g·mol−1 |
Appearance | White crystalline solid |
Odor | odorless |
Density | 2.0 g/cm3 |
Solubility in water | 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,[1] sorrel salt, sel d'oseille,[2][3] sal acetosella; or, inaccurately, salt of lemon (due to the similar acidic “lemony” taste of the edible common sorrel or garden sorrel)[4]
Potassium hydrogenoxalate occurs in some plants, notably sorrel. It is a commercial product used in photography, marble grinding, and removing ink stains.
Properties
The anhydrous product is a white, odorless, crystalline solid, hygroscopic and soluble in water (2.5 g/100 g at room temperature). The solutions are basic. Below 50 °C the much less soluble "potassium tetraoxalate" K+[C2HO4]−•C2H2O4 forms and precipitates out of solution.[5]
The monohydrate KHC2O4·H2O starts losing the water at 100 °C.[6]
The anhydrous salt was found to have remarkable elastic anisotropy, due to its crystal structure that consists of relatively rigid columns of hydrogen-bonded hydrogenoxalate anions, joined into sheets by ionic K–O bonds.[7]
Toxicity
Potassium hydrogenoxalate is strongly irritating to eyes, mucoses and gastrointestinal tract. It may cause cardiac failure and death.[5]
See also
References
- ^ "Die Net Dictionary: "Salt of Sorrel"". Archived from the original on 19 May 2012. Retrieved 19 May 2012. (retrieved via Internet Archive)
- ^ "Selency: Old bottle at pharmacy—'Salt of Sorrel". Salt of Sorrel labelled “sel d'oseille”.
- ^ "Salt of Sorrel: labelled 'sel d'oseille'". Old dark-amber glass vial marked “sel d'oseille” with protective leaden cap.
- ^ "kitchn™ It's Fresh, Green, and Super Tangy: Sorrel Is In Season!". “This fresh, “lemony” sourness has been highly prized in cuisines all over the world.”
- ^ a b ChemicalBook (2007) Potassium binoxalate Product Description
- ^ Mark Dugan (2009) Potassium binoxalate product data sheet Hummel Croton
- ^ H. Koppers (1973), 'The Elastic Constants of Monoclinic Potassium Hydrogen Oxalate Acta Crystallographica,volume A29, p. 415
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(H2C2O4) | He | ||||||||||||||||||||
Li2C2O4 | BeC2O4 | +BO3 | +CO3 | (NH4)2C2O4 +NO3 | O | F | Ne | ||||||||||||||
Na2C2O4 NaHC2O4 | MgC2O4 | Al | Si | +PO4 +PO3 | +SO4 | +Cl | Ar | ||||||||||||||
K2C2O4 KHC2O4 | CaC2O4 | Sc | Ti | V | CrC2O4 | MnC2O4 | FeC2O4 Fe2(C2O4)3 +Fe humboldtine +NH4 +Na +K +K | CoC2O4 | -Ni | CuC2O4 | Katsarosite | Ga2(C2O4)3 | Ge | As | Se | Br | Kr | ||||
Rb2C2O4 | SrC2O4 | Y2(C2O4)3 | Zr | Nb(HC2O4)5 | Mo | Tc | Ru | Rh | Pd | Ag2C2O4 | CdC2O4 | In2(C2O4)3 | SnC2O4 | Sb | Te | I | Xe | ||||
Cs2C2O4 | BaC2O4 | * | Lu2(C2O4)3 | Hf | Ta | W | Re | Os | Ir | -Pt | Au | Hg | Tl | PbC2O4 | Bi | Po | At | Rn | |||
Fr | Ra | ** | Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |||
* | La2(C2O4)3 | Ce2(C2O4)3 | Pr2(C2O4)3 | Nd2(C2O4)3 | Pm2(C2O4)3 | Sm2(C2O4)3 | Eu2(C2O4)3 | Gd2(C2O4)3 | Tb2(C2O4)3 | Dy2(C2O4)3 | Ho2(C2O4)3 | Er2(C2O4)3 | Tm2(C2O4)3 | Yb2(C2O4)3 | |||||||
** | Ac2(C2O4)3 | Th(C2O4)2 | Pa | UO2C2O4 | Np(C2O4)2 | Pu(C2O4)2 | Am | Cm2(C2O4)3 | Bk2(C2O4)3 | Cf2(C2O4)3 | Es2(C2O4)3 | Fm | Md | No |