THERMODYNAMICS OF THE DISSOCIATION OF BORIC-ACID AND POTASSIUM HYDROGEN PHTHALATE IN AQUEOUS ACETONITRILE MIXTURES

Authors
KHALILI F ISSA AA
Citation
F. Khalili et Aa. Issa, THERMODYNAMICS OF THE DISSOCIATION OF BORIC-ACID AND POTASSIUM HYDROGEN PHTHALATE IN AQUEOUS ACETONITRILE MIXTURES, Annali di chimica, 86(3-4), 1996, pp. 193-203
Citations number
26
Categorie Soggetti
Chemistry Analytical","Environmental Sciences
Journal title
Annali di chimica → ACNP
ISSN journal
00034592
Volume
86
Issue
3-4
Year of publication
1996
Pages
193 - 203
Database
ISI
SICI code
0003-4592(1996)86:3-4<193:TOTDOB>2.0.ZU;2-Y
Abstract
The dissociation of boric acid and potassium hydrogen phthalate was in vestigated in the temperature range 5.00-40.00 degrees C in acetonitri le-water mixtures. The composition of acetonitrile was varied up to 60 % (w/w). pK values for boric acid rose progressively with acetonitrile addition and temperature lowering, while those for potassium hydrogen phthalate, increased with the increase of acetonitrile in the mixture s and temperature. Values for enthalpy, entropy, free energy, and heat capacity of dissociation were calculated for each acid, and the resul ts discussed.