PRECISION MEASUREMENTS OF BENZOIC ACID DISSOCIATION CONSTANTS BY CONCENTRATION SPECTROPHOTOMETRY

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Abstract

The dissociation constant (pKT) of benzoic acid in a binary benzoic acid-water solution at 25 ± 0.5°C was determined using concentration-based UV/VIS spectrophotometry without the addition of titrants, buffer solutions, or background salts. The measured value was 4.294 ± 0.002, which differs from previously reported literature data. A new model accounting for the influence of symmetric and asymmetric electrolytes on acid-base equilibria is proposed. The observed dissociation constants of benzoic acid in aqueous salt solutions exhibit a nonlinear dependence on salt concentration in the range of 10–3 – 10–1 mol·dm–3. It was shown that as the concentration of a strong electrolyte decreases, the observed dissociation constants approach the value obtained in the pure solvent, i.e., the thermodynamic constant.

About the authors

S. S Lysova

Saint Petersburg State University of Industrial Technologies and Design; JSC "Novbytkhim"

Saint Petersburg, Russia; Gatchina, Leningrad Region, Russia

T. A Skripnikova

Saint Petersburg State University of Industrial Technologies and Design; JSC "Novbytkhim"

Email: t-star07@yandex.ru
Saint Petersburg, Russia; Gatchina, Leningrad Region, Russia

A. S Salkova

JSC "Novbytkhim"

Gatchina, Leningrad Region, Russia

Yu. E. Zevatsky

Saint Petersburg State University of Industrial Technologies and Design; JSC "Novbytkhim"; Saint Petersburg State Technological Institute (Technical University)

Saint Petersburg, Russia; Gatchina, Leningrad Region, Russia; Saint Petersburg, Russia

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