determination of the dissociation constant of some substituted phenols by potentiometric method in acetonitrile-water mixtures
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2010
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Abstract
Abstract: The dissociation constants of phenol, 2−methylphenol, 3−methylphenol, 4−methylphenol, and 4−ethylphenol have been determined by potentiometric titration in a electrochemical cell with glass electrode at 25 oC in water and in the mixtures of acetonitrile and water where the following volume fractions (before mixing) of acetonitrile were used: 0.10, 0.20, and 0.30. The ionic strength of the solutions was adjusted to be 0.1 mol dm−3 using KCl. The dissociation constants were calculated by using the commercial Hyperquad 2008 program. The obtained results are in good concordance withliterature values.
Key words: Phenols, acid dissociation constant, potentiometric method.
Bazı Substitue Fenollerin Ayrışma Sabitlerinin Asetonitril-Su
Karışımlarında Potansiyometrik Metotla Tayini
Özet: Fenol, 2-metilfenol, 3-metilfenol, 4-metilfenol ve 4-etilfenol'ün ayrışma sabitleri %10-20-30 oranlarında hazırlanan asetonitril –su karışımında 25 oC potansiyometrik olarak elektrokimyasal hücrede elektrot ile tayin edilmiştir.Titrasyon çözeltilerinde iyonik şiddet KCl kullanılarak 0.1 mol dm−3 olarak ayarlanmıştır. Ayrışma sabitleri ticari bir program olan Hyperquad 2008 ile hesaplanmıştır. Elde edilen
sonuçlar literatürdeki değerlerle uyumluluk göstermektedir.
Anahtar kelimeler: Fenol, asidik ayrışma sabiti, potansiyometrik yöntem.
| Reference Key |
ertoku2010sleymandetermination
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|---|---|
| Authors | ;Güzide Ertokuş;Ahmet Aktaş |
| Journal | clinical chemistry |
| Year | 2010 |
| DOI |
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