Clover salt

Structural formula
General
Surname	Clover salt
other names	Potassium hydrogen oxalate Monopotassium oxalate Oxalic acid monopotassium salt Sorrel salt
Molecular formula	C 2 HKO 4
Brief description	white odorless crystals
External identifiers / databases
CAS number 127-95-7 EC number 204-873-0 ECHA InfoCard 100.004.431 PubChem 23662386 Wikidata Q906025
properties
Molar mass	128.12 g mol −1
Physical state	firmly
density	2.04 g cm −3 (hydrate)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 312-302 P: 264-270-280-301 + 312-302 + 352-312-321-330-362 + 364-501
Toxicological data	7500 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Clover salt , sometimes also called bitter clover salt , is a harmful potassium salt of oxalic acid (clover acid) contained in wood sorrel ( Oxalis acetosella ), the correct name is potassium hydrogen oxalate with the formula KHC ₂ O ₄ .

properties

Clover salt has a monoclinic crystal system. The monohydrate of clover salt loses its water of crystallization at around 100 ° C.

use

Clover salt is used to clean minerals as it can be used to remove limonitic coatings and crusts. Aqueous solutions of clover salt are also recommended for removing rust stains of all kinds, including for bleaching the bluish iron stains on oak wood .
Clover salt is the standard polish for marble .

Individual evidence

1. ↑ ^{a b c d} potassium binoxalate MSDS (Hummel Croton) (PDF; 34 kB), accessed on December 27, 2019.
2. ↑ ^{a b} Tenax Spa: TeEtch , accessed December 27, 2019.
3. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-82.
4. ↑ Jean d 'Ans: Pocket book for chemists and physicists. Springer, 1998, ISBN 978-3-540-60035-0 , p. 504 ( limited preview in the Google book search).