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Issue 8, 1999
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Spectroscopic measurement of the acid dissociation constant of 2-naphthol and the second dissociation constant of carbonic acid at elevated temperatures

Abstract

2-Naphthol can be used to measure the pH of aqueous solutions if the acid dissociation constant for 2-naphthol is known at a given temperature. The temperature dependence of the acid dissociation constant for 2-naphthol was spectroscopically determined in borate buffer solutions under vapor-saturated pressure up to 200°C. The result was where T is in Kelvin. The pH of carbonate buffer solutions was measured by obtaining the UV–visible spectra of 2-naphthol and utilized to determine the second dissociation constant of carbonic acid up to 175°C under vapor-saturated pressure. The result was where T is in Kelvin. By using the temperature dependence of the dissociation constant, the isocoulombic reaction was studied. The plot of -log Kisoc against 1/T was approximately linear in the temperature range studied. The linearity can be used to predict the dissociation constant by the extrapolation of -log Kisoc to higher temperatures.

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Article information


Phys. Chem. Chem. Phys., 1999,1, 1893-1898
Article type
Paper

Spectroscopic measurement of the acid dissociation constant of 2-naphthol and the second dissociation constant of carbonic acid at elevated temperatures

S. Park, H. Kim, K. Kim, J. Lee and D. Lho, Phys. Chem. Chem. Phys., 1999, 1, 1893
DOI: 10.1039/A900248K

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