Deprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanol
The protonation constant values of two hydroxybenzoic acids (salicylic and 5-nitrosalicylic acid) were studied in some water-ethanol solutions using spectrophotometric and potentiometric methods at 25°C and in an ionic strength of 0.1 M sodium perchlorate. The results indicated that the pKa valu...
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| Format: | Article |
| Language: | English |
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Serbian Chemical Society
2011-01-01
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| Series: | Journal of the Serbian Chemical Society |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2011/0352-51391100129F.pdf |
| _version_ | 1819037287862763520 |
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| author | Faraji Mohammad Farajtabar Ali Gharib Farrokh Ghasemnejad-Borsa Hassan |
| author_facet | Faraji Mohammad Farajtabar Ali Gharib Farrokh Ghasemnejad-Borsa Hassan |
| author_sort | Faraji Mohammad |
| collection | DOAJ |
| description | The protonation constant values of two hydroxybenzoic acids (salicylic and 5-nitrosalicylic acid) were studied in some water-ethanol solutions using spectrophotometric and potentiometric methods at 25°C and in an ionic strength of 0.1 M sodium perchlorate. The results indicated that the pKa values increase with increasing proportion of ethanol in mixed solvent. The dependence of the protonation constants on the variation of the solvent were correlated by the dielectric constants of the media. Furthermore, for a better understanding of the solvent influence, the obtained results were explained in terms of the Kamlet-Taft parameters α (hydrogen-bond donor acidity), π |
| first_indexed | 2024-12-21T08:19:02Z |
| format | Article |
| id | doaj.art-7083f38a4f4249a2bf546c8ac044ea94 |
| institution | Directory Open Access Journal |
| issn | 0352-5139 |
| language | English |
| last_indexed | 2024-12-21T08:19:02Z |
| publishDate | 2011-01-01 |
| publisher | Serbian Chemical Society |
| record_format | Article |
| series | Journal of the Serbian Chemical Society |
| spelling | doaj.art-7083f38a4f4249a2bf546c8ac044ea942022-12-21T19:10:28ZengSerbian Chemical SocietyJournal of the Serbian Chemical Society0352-51392011-01-0176111455146310.2298/JSC100506129FDeprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanolFaraji MohammadFarajtabar AliGharib FarrokhGhasemnejad-Borsa HassanThe protonation constant values of two hydroxybenzoic acids (salicylic and 5-nitrosalicylic acid) were studied in some water-ethanol solutions using spectrophotometric and potentiometric methods at 25°C and in an ionic strength of 0.1 M sodium perchlorate. The results indicated that the pKa values increase with increasing proportion of ethanol in mixed solvent. The dependence of the protonation constants on the variation of the solvent were correlated by the dielectric constants of the media. Furthermore, for a better understanding of the solvent influence, the obtained results were explained in terms of the Kamlet-Taft parameters α (hydrogen-bond donor acidity), πhttp://www.doiserbia.nb.rs/img/doi/0352-5139/2011/0352-51391100129F.pdfpKahydroxybenzoic acidsBinary mixturesSolvent effects |
| spellingShingle | Faraji Mohammad Farajtabar Ali Gharib Farrokh Ghasemnejad-Borsa Hassan Deprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanol Journal of the Serbian Chemical Society pKa hydroxybenzoic acids Binary mixtures Solvent effects |
| title | Deprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanol |
| title_full | Deprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanol |
| title_fullStr | Deprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanol |
| title_full_unstemmed | Deprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanol |
| title_short | Deprotonation of salicylic acid and 5-nitrosalicylic acid in aqueous solutions of ethanol |
| title_sort | deprotonation of salicylic acid and 5 nitrosalicylic acid in aqueous solutions of ethanol |
| topic | pKa hydroxybenzoic acids Binary mixtures Solvent effects |
| url | http://www.doiserbia.nb.rs/img/doi/0352-5139/2011/0352-51391100129F.pdf |
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