Cerium oxalate

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Cerium oxalate
Cerium oxalate.jpg
CAS number 139-42-4 YesY, 15750-47-7 (unspecified hydrate) YesY
PubChem 8762
UNII 96P72VE680 YesY
ATC code A04AD02
Molecular formula C6Ce2O12
Molar mass 544.29 g mol−1
Appearance White crystals
Melting point Decomposes
Solubility in water Slightly soluble
R-phrases R21/22
S-phrases S24/25
Main hazards Harmful (Xn)
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Cerium(III) oxalate or cerous oxalate is the inorganic cerium salt of oxalic acid. It is a white crystalline solid with the chemical formula of Ce2(C2O4)3. It could be obtained by the reaction of oxalic acid with cerium(III) chloride.


Cerium(III) oxalate is used as an antiemetic. It has been identified as part of the invisible ink that was used by Stasi operatives during the Cold War.[1]


Cerium(III) oxalate irritates skin and mucous membranes, and is a strong irritant to eyes. If it gets into the eyes, there is a danger of severe eye injury.

Cerium salts increase the blood coagulation rate, and exposure to cerium salts can cause sensitivity to heat.

Oxalates are corrosive to tissue and are powerful irritants. They have a caustic effect on the linings of the digestive tracts and can cause kidney damage.