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Calcium oxalate
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== Chemical properties == Calcium oxalate is a combination of calcium ions and the conjugate base of [[oxalic acid]], the oxalate anion. Its aqueous solutions are slightly basic because of the basicity of the oxalate ion. The basicity of calcium oxalate is weaker than that of [[sodium oxalate]], due to its lower solubility in water. Solid calcium oxalate hydrate has been characterized by [[X-ray crystallography]]. It is a [[coordination polymer]] featuring planar oxalate anions linked to calcium, which also has water [[ligand]]s.<ref name=Acta>{{cite journal|journal=Acta Crystallogr. B|year=1981|volume=37|issue=4|pages=826β829|title=The Structure of Whewellite, CaC<sub>2</sub>O<sub>4</sub><sup>.</sup>H<sub>2</sub>O, at 328 K|author=S. Deganello|doi=10.1107/S056774088100441X|doi-access=}}</ref>
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