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Department of Chemistry, University of Delhi, Delhi-110 007 Manuscript received 1 November 1980, revised 7 September 1981, accepted 10 December 1981 The pKavalues of J.hydroxycoumarin, 4-hydroxycoumarin and 7-hydroxycoumario ID ethanol+water mixtures in the 25-90% (by volume) ethanol composition range have been determined ƤH-metrically using a combination of glass and calomel electrode system, at 25, 35 and 45•, The thermodynamic parameters ∆Gº. a•, ∆Hº and ∆Sº ha\e also been evaluated.doi:10.5281/zenodo.6355649 fatcat:5pc7nl3jljd4dgvqrrh4vyyltu