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- YAMAKAWA Isao
- College of Industrial Technology, Nihon University;
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- NAKAJIMA Toyohiko
- College of Industrial Technology, Nihon University;
Bibliographic Information
- Other Title
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- ピリジン中におけるガラス電極のキャリブレーション
Abstract
For the purpose of calibrating the glass electrode in py r i dine, the conductometric and the potentiometric measurements were made for the mixtures of the nitrophenols with the ir tetrabutylammonium salts. A new equation have been derived for calculating the electrol y tic conductivity of ion from the ionic concentrations. This equation was applied to t he experimental values of conductivity in order to obtain more reliable equilibrium constants in these system. It was necessary to take into account the ion pair formation between the homo c onjugate ion and tetrabutylammonium ion, especially in the case of the very weak a c ids such as mono-nitrophenols. The equilibrium constants represented by eq. (3), (4), (6) and ( 18)were determined respectively as given in Table 4. A saturated solution of tetramethylammonium chloride in pyridine was used as the electrolyte solution of the reference electrode for the potentiometric measurement. The r elations between the potential of the glass electrode, E, and log(ca/c8), where ca and c8 den ote the analytical concentrations of nitrophenols and their tetrabutylammonium salts, respecti v ely, are summarized in Fig.2. The hydrogen ion activity, a(H+), in the mixtures of the nitrophenols and their salts was calculated by using ca, c8 and the equilibrium constants obtaine d above. The calibration curve in pyridine which pa(H+) values are plotted vs. po tential, are shown in Fig.3. A good linear relation was obtained in the mixtures of the nitr ophenols and their salts. The equation-for the calculation of pa(H+) from glass electrod e measurements was pa(H+)=(352-E)/64, where E was given in millivolts.
Journal
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- NIPPON KAGAKU KAISHI
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NIPPON KAGAKU KAISHI 1990 (3), 244-249, 1990-03-10
The Chemical Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282679333609856
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- NII Article ID
- 130004159337
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- ISSN
- 21850925
- 03694577
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed