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thorium oxalate : ウィキペディア英語版 | thorium oxalate
Thorium oxalate is a white insoluble compound of thorium that is prepared by mixing a thorium nitrate solution in acid medium with an oxalic acid solution. By mixing 0.5 M thorium nitrate solution with 0.5 M oxalic acid solution at room temperature thorium oxalate dihydrate ( Th(C2O4)2.2H2O ) is obtained. Thorium oxalate hexahydrate is obtained when precipitated from 2 M nitric acid solution. On heating to 500° it is converted to thorium oxide.〔Enver Oktay, Ahmet Yayli (2001) (''Physical properties of thorium oxalate powders and their influence on the thermal decomposition'' ) Journal of Nuclear Materials Volume 288, Issue 1, January 2001, Pages 76–82〕 The solubility product (Ksp) of thorium oxalate is 5.01 X 10−25〔Taishi KOBAYASHI, Takayuki SASAKI, Ikuji TAKAGI & Hirotake MORIYAMA (2009) (''Solubility of Thorium(IV) in the Presence of Oxalic and Malonic Acids'' ) Journal of Nuclear Science and Technology, Vol. 46, No. 11, p. 1085–1090〕 Density of anhydrous thorium oxalate is 4.637 g/cm3. ==References==
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