- PII
- S3034553725110163-1
- DOI
- 10.7868/S3034553725110163
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 99 / Issue number 11
- Pages
- 1725-1731
- Abstract
- The dissociation constant (pK) 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 – 10 mol·dm. 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.
- Keywords
- бензойная кислота термодинамическая константа диссоциации метод концентрационной УФ/вид-спектрофотометрии
- Date of publication
- 19.05.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 29
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