Abstract
Conditions for the hydrolysis of parabanic to oxaluric acid and to urea and oxalic acid have been studied by means of both titration and ultraviolet absorption data. These studies show that at room temperature free parabanic acid slowly changes to oxaluric acid whereas the salts of the former change to the latter in a few minutes. The splitting of oxaluric acid to oxalic acid and urea is a slower process. Parabanic acid behaves as a monobasic acid with a p K value of 6.10. Oxaluric acid also shows only one inflection of its titration curve at an approximate pH of 2.0. In this it somewhat resembles oxalic acid (p K 1 = 1.4) but lacks any second constant corresponding to the K 2 value of oxalic acid at 4.3.
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