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potentiometric determination of acidity constants of some synthesized organic compounds in organic-water media
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نویسنده
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baluja sh. ,ramavat p. ,nandha k.
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منبع
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journal of sciences islamic republic of iran - 2016 - دوره : 27 - شماره : 4 - صفحه:321 -328
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چکیده
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The acidity constants of some synthesized protonated pyrazolo quinazoline compounds were determined potentiometrically at ionic strength of 0.1 m in dmf: water (60:40 v/v) system at different temperatures (298.15 k to 318.15 k). the pka values have been found to increase with increasing electron-donating nature of substitutions. some thermodynamics parameters such as enthalpy (?h°), gibb’s free energy (?g°) and entropy (?s°) of reactions have also been evaluated at different temperatures for these systems. the thermodynamic parameters indicate that dissociation process is not spontaneous and exothermic.
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کلیدواژه
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acidity constant ,pyrazolo[5 ,1-b]quinazolines ,enthalpy ,entropy ,gibb’s energy
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آدرس
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physical chemistry laboratory, department of chemistry, saurashtra university, rajkot-360005 (gujarat), india, هندوستان, physical chemistry laboratory, department of chemistry, saurashtra university, rajkot-360005 (gujarat), india, هندوستان, physical chemistry laboratory, department of chemistry, saurashtra university, rajkot-360005 (gujarat), india, هندوستان
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Authors
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