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 pK(i) = -34.97 + 2947/T + 6.086 ln(T) 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 pK2 = 4201.48 229 200/T - 661.21 ln(T) + 0.647 53T + 13 1498 200/T2 where T is in Kelvin. By using the temperature dependence of the dissociation constant, the isocoulombic reaction was studied. The plot of -log K(isoc) 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 K(isoc) to higher temperatures.
| Original language | English |
|---|---|
| Pages (from-to) | 1893-1898 |
| Number of pages | 6 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 1 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 1999 Apr 15 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Atomic and Molecular Physics, and Optics
Cite this
Spectroscopic measurement of the acid dissociation constant of 2- naphthol and the second dissociation constant of carbonic acid at elevated temperatures. / Park, Sungnam; Kim, Hyeongnam; Kim, Keon; Lee, JeongAe; Lho, Dong seok.
In: Physical Chemistry Chemical Physics, Vol. 1, No. 8, 15.04.1999, p. 1893-1898.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Spectroscopic measurement of the acid dissociation constant of 2- naphthol and the second dissociation constant of carbonic acid at elevated temperatures
AU - Park, Sungnam
AU - Kim, Hyeongnam
AU - Kim, Keon
AU - Lee, JeongAe
AU - Lho, Dong seok
PY - 1999/4/15
Y1 - 1999/4/15
N2 - 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 pK(i) = -34.97 + 2947/T + 6.086 ln(T) 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 pK2 = 4201.48 229 200/T - 661.21 ln(T) + 0.647 53T + 13 1498 200/T2 where T is in Kelvin. By using the temperature dependence of the dissociation constant, the isocoulombic reaction was studied. The plot of -log K(isoc) 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 K(isoc) to higher temperatures.
AB - 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 pK(i) = -34.97 + 2947/T + 6.086 ln(T) 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 pK2 = 4201.48 229 200/T - 661.21 ln(T) + 0.647 53T + 13 1498 200/T2 where T is in Kelvin. By using the temperature dependence of the dissociation constant, the isocoulombic reaction was studied. The plot of -log K(isoc) 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 K(isoc) to higher temperatures.
UR - http://www.scopus.com/inward/record.url?scp=0033561567&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033561567&partnerID=8YFLogxK
U2 - 10.1039/a900248k
DO - 10.1039/a900248k
M3 - Article
AN - SCOPUS:0033561567
VL - 1
SP - 1893
EP - 1898
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 8
ER -