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An 'oxalate' (also 'ethanedioate') is a salt or ester of oxalic acid. As a salt, the oxalate anion has the chemical formula C₂O₄²⁻ or (COO)₂²⁻.
Consumption of oxalates (for example, the grazing of animals on oxalate-containing plants such as greasewood) may result in kidney disease or even death due to oxalate poisoning.
The charge on oxalate allows it to act as a chelator of various positively charged metal ions.
Much of its other properties resemble oxalic acid.

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Examples

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Examples

★ sodium oxalate - Na₂C₂O₄

★ calcium oxalate - CaC₂O₄, a major component of kidney stones

★ dimethyl oxalate - (CH₃)₂C₂O₄

★ phenyl oxalate ester - (C₆H₅)₂C₂O₄

★ Potassium ferrioxalate - [K₃[Fe(C₂O₄)₃], an iron complex with oxalate ligands

★ ammonium oxalate - (NH₄)₂C₂O₄

References