Topic summary
Hydrogenoxalate
Hydrogenoxalate or hydrogen oxalate(IUPAC name: 2-Hydroxy-2-oxoacetate) is an anion with chemical formulaHC2O−4 or HO−C(=O)−CO−2, derived from oxalic acid by the loss of a single proton; or, alternatively, from the oxalate anion C2O2−4 by addition of a proton. The name is also used for any salt containing this anion. Especially in older literature, hydrogenoxalates may also be referred to as bioxalates, acid oxalates, or monobasic oxalates. Hydrogenoxalate is amphoteric, in that it can react both as an acid or a base.
Well characterized salts include sodium hydrogenoxalate (NaHC2O4), potassium hydrogenoxalate (KHC2O4), ([NH4]HC2O−4), (RbHC2O4) and ([(CH3)2NH]HC2O−4).