==Reactions==Oxalic acid is a relatively strong acid, despite being a carboxylic acid::C2O4H2 → C2O4H− + H+; pKa = 1.27:C2O4H− → C2O42− + H+; pKa = 4.27Oxalic acid undergoes many of the reactions characteristic of other carboxylic acids.
Za primerjavo, je približno 3.000 krat močnejša od ocetne kisline.