Potentiometric Determination of pK(a) Values of Benzoic Acid and Substituted Benzoic Acid Compounds in Acetonitrile-Water Mixtures
ASIAN JOURNAL OF CHEMISTRY, cilt.21, sa.5, ss.3825-3835, 2009 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 21 Sayı: 5
- Basım Tarihi: 2009
- Dergi Adı: ASIAN JOURNAL OF CHEMISTRY
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.3825-3835
- Süleyman Demirel Üniversitesi Adresli: Evet
Özet
The dissociation pK(a) values of benzoic acid and substitued benzoic acids have been determinated in water and acetonitrile-water media (10, 20 and 30 %) by potentiometric measurements. The results obtained shows that the solvents affect the acid equilibrium. The potentiometric data of benzoic compounds at various pH values (pH 2.0-11.0) were recorded. The calibration of the electrode system was done potentiometrically by Gran's method. Data were processed using the Hyperquad 2006 which calculate stability constants of the pure species by multi linear regression. The obtained results are in good concordance with literature values.