Effect of Ionic Strength on Deprotonation of Salicylic Acid and its Derivative
محل انتشار: مجله شیمی فیزیکی و الکتروشیمی، دوره: 4، شماره: 1
سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 60
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شناسه ملی سند علمی:
JR_JPEM-4-1_003
تاریخ نمایه سازی: 24 بهمن 1402
چکیده مقاله:
The protonation constant values of salicylic and ۵-nitrosalicylic acid werestudied by a combinationof spectrophotometric and potentiometric methods at ۲۵ °C in wide range of ionic strength. The ionicstrength of solutions was kept constant by sodium perchlorate as background electrolyte at ۰.۱۰ to ۳.۰ moldm-۳. Potentiometer was calibrated according to Gran method at each of ionic strength. The pKa valueswere calculated using STAR program by multivariate curve fitting of absorbance data. The dependence ofdeprotonation constants on ionic strength were explained by means of Specific ion Interaction Theory (SIT).Activity coefficients of species were calculated by a modified SIT approach. The specific ion interactionparameters were extracted associated with the thermodynamic protonation constant.
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نویسندگان
Mohammad Faraji Faraji
Department of Chemistry, Babol Branch, Islamic Azad University, Babol, Iran
Ali Farajtabar
bDepartment of Chemistry, Jouybar Branch, Islamic Azad University, Jouybar, Iran