Acid Dissociation Constants in Ethanol Water Mixture Some Hydroxy Coumarins
| Main Authors: | HARISH KUMAR ARORA, ANITA RANI AGGARWAL, R, P. SINGH |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1982
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6355649 |
Daftar Isi:
- 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 3-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 45o, The thermodynamic parameters ∆Go, ∆Ho and ∆So ha\e also been evaluated. Increase in the concentration of water from 25 to 90% by volume, and temperature results in the decrease of pKa for all three coumarins.