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Abstract
The ionic equilibria of anthralin were examined at 25°C in aqueous solutions varying in pH from 5.10 to 11.74. Despite the presence of three phenol groups, only one pKa was observed under a these experimental conditions and even at pH - 11.74 there was no spectroscopic evidence for the presumed second pKa Possible a causes for this result are discussed. The experimentally observed pKa was 9.06 which yielded a thermodynamic pKa estimate of 9.38. These results agreed well with one of two conflicting reports in the literature.