Spectrophotometric determination of pK(a) values for some benzoic acid compounds in acetonitrile-water mixtures
ASIAN JOURNAL OF CHEMISTRY, cilt.18, sa.3, ss.2168-2178, 2006 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 18 Sayı: 3
- Basım Tarihi: 2006
- Dergi Adı: ASIAN JOURNAL OF CHEMISTRY
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.2168-2178
- Süleyman Demirel Üniversitesi Adresli: Evet
Özet
The dissociation pK(a) values of benzoic acid and substituted benzoic acids have been determined in water and acetonitrile-water mixtures (10%, 20%, 30%) by spectrophotometric measurements. The results obtained show that the solvents affect the acid equilibrium. Acetonitrile acts as a strongly differentiating solvent with a modest solvating power for many polar ionic solutes. Linear relationships between pK(a) values in acetonitrile-water mixtures and pK(a) values in pure water have been established for fourteen benzoic acids. rhe pHab is a computer program using the calculation dissociation constants from spectrophotometric data obtained from solutions at known pH.