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KMID : 1059519860300020152
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Journal of the Korean Chemical Society
1986 Volume.30 No. 2 p.152 ~ p.158
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The Effect of Substituent, Pressure and Temperature on the Dissociation Constants of Organic Acids. (2) Dissociation Constants of Some Substituted Naphthols in Aqueous Solution
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Hwang Jung-Ui
Bae Zun-Ung
Chung Jong-Jae
Jung Jae-Won
Chang Kyung-Hee
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Abstract
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The dissociation constants of 4-Cl-1-naphthol, 6-Br-2-naphthol and 8-NH2-2-naphthol in aqueous solution were measured by spectroscopic method in the temperature range from 25 to 40℃ and pressure up to 2000bar. The dissociation constants were decreased as the substituents were inserted in naphthol f rom 4.4 × 10-10 to 5.82 × 10-11 as chloride compound and 2.5 × 10-10 to 3.44 × 10-11 or 4.21 × 10-11 as bromine or amino compounds, respectively. This decrease can be explained with the I-or R-effects of substituents. From the dissociation constants various thermodynamic properties were calculated and discussed the characteristics of the dissociation reaction.
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