Spectrophotometric determination of the acid dissociation constants for cacodylic acid and p-Nitrophenol at elevated temperatures |
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| Authors: | Tae-Wook Shin Keon Kim In-Ja Lee |
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| Institution: | (1) Department of Chemistry, Dongguk University, Kyongju-Si, 780-714 Kyongbuk, Korea;(2) Department of Chemistry, Korea University, 136-701 Seoul, Korea |
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| Abstract: | Using 2.5-dinitrophenol as an optical indicator, the pKa of cacodylic acid were spectrophotometrically determined at elevated temperatures under saturation vapor pressures. The result
is pKa = -26.41 + 1296/T + 4.973 InT whereT is in Kelvin. In a similar way, the pKa ofp-nitrophenol were obtained up to 200‡C giving pKa = -24.82 + 2135/T + 4.353 InT From these results, several thermodynamic functions of cacodylic acid andp- nitrophenol were calculated. |
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| Keywords: | pH pKa 2 5-dinitrophenol cacodylic acid p-nitrophenol acid dissociation constant thermodynamic function |
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