thorium oxalate

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| ImageFile = Th(C2O4)2(H2O)4 (249614).png

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| CASNo = 2040-52-0

| PubChem = 74880

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| EINECS = 218-038-3

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| Section2 = {{Chembox Properties

| C=4|O=8|Th=1

| Appearance =

| Density = 4.637 g/cm³ (anhydrous)

| MolarMass = 408.07 g/mol
444.114 g/mol (dihydrate)

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| SolubilityProduct = 5.01{{resx}}10⁻²⁵

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Thorium oxalate is the inorganic compound with the formula Th(C₂O₄)₂(H₂O)₄. It is a white insoluble solid prepared by the reaction of thorium(IV) salts with an oxalic acid.Enver Oktay, Ahmet Yayli (2001) [http://www.sciencedirect.com/science/article/pii/S0022311500005717 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 material is a coordination polymer. Each Th(IV) center is bound to 10 oxygen centers: eight provided by the bridging oxalates and two by a pair of aquo ligands. Two additional water of hydration are observed in the lattice.{{cite journal |doi=10.1016/j.jssc.2007.12.008|title=Hydrothermal Chemistry of Th(IV) with Aromatic dicarboxylates: New Framework Compounds and in Situ Ligand Syntheses|year=2008|last1=Ziegelgruber|first1=Kate L.|last2=Knope|first2=Karah E.|last3=Frisch|first3=Mark|last4=Cahill|first4=Christopher L.|journal=Journal of Solid State Chemistry|volume=181|issue=2|pages=373–381|bibcode=2008JSSCh.181..373Z}}

The solubility product (K_sp) of thorium oxalate is 5.01{{resx}}10⁻²⁵.Taishi Kobayashi, Takayuki Sasaki, Ikuji Takagi, Hirotake Moriyama (2009) [http://www.tandfonline.com/doi/abs/10.1080/18811248.2009.9711619 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.