Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy

The dissociation equilibrium of 4-methylphenol in aqueous solutions has been studied spectrophotometrically over the temperature range 298 to 448 K; at higher temperatures the anion decomposed appreciably. The solutions that were studied had different ratios of weak acid to conjugated base, and the...

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Autores principales:	Mendez De Leo, Lucila Paula, Bianchi, Hugo Luis, Fernandez Prini, Roberto
Publicado:	2002
Materias:	4-methylphenol Dissociation Equilibrium High temperature Thermodynamics Electrolytes High temperature effects Ionic strength Light absorption Negative ions Phenols Sodium compounds Solutions Spectrophotometry Ultraviolet spectroscopy Water Isocoulombic reaction Methylphenol Sodium trifluoromethane sulfonate
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219614_v34_n9_p1467_MendezDeLeo http://hdl.handle.net/20.500.12110/paper_00219614_v34_n9_p1467_MendezDeLeo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00219614_v34_n9_p1467_MendezDeLeo
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spelling	paper:paper_00219614_v34_n9_p1467_MendezDeLeo2023-06-08T14:44:40Z Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy Mendez De Leo, Lucila Paula Bianchi, Hugo Luis Fernandez Prini, Roberto 4-methylphenol Dissociation Equilibrium High temperature Thermodynamics Dissociation Electrolytes High temperature effects Ionic strength Light absorption Negative ions Phenols Sodium compounds Solutions Spectrophotometry Ultraviolet spectroscopy Water Isocoulombic reaction Methylphenol Sodium trifluoromethane sulfonate Thermodynamics The dissociation equilibrium of 4-methylphenol in aqueous solutions has been studied spectrophotometrically over the temperature range 298 to 448 K; at higher temperatures the anion decomposed appreciably. The solutions that were studied had different ratios of weak acid to conjugated base, and the ionic strength was varied with sodium trifluoromethane sulfonate between 0.0 mol·kg-1 and 0.3 mol·kg-1. The overall analysis of the optical absorption of the solutions in the range 250 to 380 nm was based on the corresponding isocoulombic reaction. We report the values of the thermodynamic quantities at 298.2 K for the two equilibria. The results also suggest that 4-methylphenol may be used as an indicator to study equilibria of other weak aqueous electrolytes. © 2002 Elsevier Science Ltd. All rights reserved. Fil:Méndez De Leo, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bianchi, H.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fernández-Prini, R.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219614_v34_n9_p1467_MendezDeLeo http://hdl.handle.net/20.500.12110/paper_00219614_v34_n9_p1467_MendezDeLeo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	4-methylphenol Dissociation Equilibrium High temperature Thermodynamics Dissociation Electrolytes High temperature effects Ionic strength Light absorption Negative ions Phenols Sodium compounds Solutions Spectrophotometry Ultraviolet spectroscopy Water Isocoulombic reaction Methylphenol Sodium trifluoromethane sulfonate Thermodynamics
spellingShingle	4-methylphenol Dissociation Equilibrium High temperature Thermodynamics Dissociation Electrolytes High temperature effects Ionic strength Light absorption Negative ions Phenols Sodium compounds Solutions Spectrophotometry Ultraviolet spectroscopy Water Isocoulombic reaction Methylphenol Sodium trifluoromethane sulfonate Thermodynamics Mendez De Leo, Lucila Paula Bianchi, Hugo Luis Fernandez Prini, Roberto Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy
topic_facet	4-methylphenol Dissociation Equilibrium High temperature Thermodynamics Dissociation Electrolytes High temperature effects Ionic strength Light absorption Negative ions Phenols Sodium compounds Solutions Spectrophotometry Ultraviolet spectroscopy Water Isocoulombic reaction Methylphenol Sodium trifluoromethane sulfonate Thermodynamics
description	The dissociation equilibrium of 4-methylphenol in aqueous solutions has been studied spectrophotometrically over the temperature range 298 to 448 K; at higher temperatures the anion decomposed appreciably. The solutions that were studied had different ratios of weak acid to conjugated base, and the ionic strength was varied with sodium trifluoromethane sulfonate between 0.0 mol·kg-1 and 0.3 mol·kg-1. The overall analysis of the optical absorption of the solutions in the range 250 to 380 nm was based on the corresponding isocoulombic reaction. We report the values of the thermodynamic quantities at 298.2 K for the two equilibria. The results also suggest that 4-methylphenol may be used as an indicator to study equilibria of other weak aqueous electrolytes. © 2002 Elsevier Science Ltd. All rights reserved.
author	Mendez De Leo, Lucila Paula Bianchi, Hugo Luis Fernandez Prini, Roberto
author_facet	Mendez De Leo, Lucila Paula Bianchi, Hugo Luis Fernandez Prini, Roberto
author_sort	Mendez De Leo, Lucila Paula
title	Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy
title_short	Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy
title_full	Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy
title_fullStr	Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy
title_full_unstemmed	Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy
title_sort	thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy
publishDate	2002
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219614_v34_n9_p1467_MendezDeLeo http://hdl.handle.net/20.500.12110/paper_00219614_v34_n9_p1467_MendezDeLeo
work_keys_str_mv	AT mendezdeleolucilapaula thermodynamicsof4methylphenoldissociationinwaterathightemperatureusinguvvisspectroscopy AT bianchihugoluis thermodynamicsof4methylphenoldissociationinwaterathightemperatureusinguvvisspectroscopy AT fernandezpriniroberto thermodynamicsof4methylphenoldissociationinwaterathightemperatureusinguvvisspectroscopy
_version_	1768544488358150144

Thermodynamics of 4-methylphenol dissociation in water at high temperature using uv-vis spectroscopy

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