Holmium(III) oxalate
{{Chembox
| Name =
| ImageFile = Holmium oxalate.png
| ImageSize =
| ImageAlt =
| IUPACName =
| OtherNames =
| Section1 = {{Chembox Identifiers
| index1_label=dihydrate
| index2_label=decahydrate
| CASNo = 3269-15-6
| CASNo_Ref ={{cascite|correct|CAS}}
| CASNo2 = 28965-57-3
| ChemSpiderID = 144740
| ChemSpiderID2 = 21428149
| DTXSID2 = DTXSID90648470
| EINECS = 221-886-7
| PubChem = 165098
| PubChem2 = 25021755
| StdInChI=1S/3C2H2O4.2Ho/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6
| StdInChIKey=DYYFBWLZDJSPGO-UHFFFAOYSA-H
| InChI1=1S/3C2H2O4.2Ho.2H2O/c3*3-1(4)2(5)6;;;;/h3*(H,3,4)(H,5,6);;;2*1H2/q;;;2*+3;;/p-6
| InChIKey1=MIBITVHERFMSTH-UHFFFAOYSA-H
| InChI2=1S/3C2H2O4.2Ho.10H2O/c3*3-1(4)2(5)6;;;;;;;;;;;;/h3*(H,3,4)(H,5,6);;;10*1H2/q;;;2*+3;;;;;;;;;;/p-6
| InChIKey2=OKKLEXNPKBZYQY-UHFFFAOYSA-H
| SMILES1 = [Ho+3].[Ho+3].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-].O.O
| SMILES2 = [Ho+3].[Ho+3].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-].O.O.O.O.O.O.O.O.O.O
| SMILES = [Ho+3].[Ho+3].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-]
}}
| Section2 = {{Chembox Properties
| Formula = Ho2(C2O4)3
| MolarMass =
| Appearance = yellow crystals (heptahydrate)
| Density =
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| Section3 = {{Chembox Hazards
| MainHazards =
| FlashPt =
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Holmium(III) oxalate is the oxalate salt of holmium, with the chemical formula Ho2(C2O4)3. It exists in anhydrous and hydrated forms.
Properties
Holmium(III) oxalate decahydrate decomposes in heat to obtain the dihydrate, which is further heated to obtain the anhydrous form, and finally holmium(III) oxide is obtained.{{cite journal|last1=Wendlandt|first1=W. W.|title=Thermal Decomposition of Rare Earth Metal Oxalates|journal=Analytical Chemistry|volume=31|issue=3|year=1959|pages=408–410|issn=0003-2700|doi=10.1021/ac60147a024}} It reacts with hydrochloric acid to obtain H[Ho(C2O4)2]·6H2O.{{cite journal |last1=Moebius |first1=R. |last2=Matthes |first2=F. |title=The exchange of oxalate ions for chloride ions of the oxalate hydrates of the rare earths and yttrium |journal=Zeitschrift für Chemie |year=1964 |volume=4 |issue=6 |pages=234–235}}