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Potentiometric Measurements of the Hydrogen Ion Concentrations at Constant Ionic Strength
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- ISHIKAWA Norihisa
- Department of Industrial Chemistry, College of Engineering, Chubu University;
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- MATSUSHITA Hiroshi
- Department of Industrial Chemistry, College of Engineering, Chubu University;
Bibliographic Information
- Other Title
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- 一定イオン強度における水素イオン濃度の電位差測定
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Description
The calibration of a glass-reference electrode pair with liquid-junction was examined for measurements of the hydrogen ion concentrations (10-2-10-7moldm-3) at high ionic strengths. The relation between pH-values (pH) based on the pH scale standardized with pHstandards and hydrogen ion concentrations (h) is expressed by the relationship pHm=M⋅ph+C where ph= log h. The M-value is related to liquid-junction potentials between the salt bridge and two pH-standards. The M-value of 1.008+0.002 was obtained for the three buffer systems (strong acid, acetic acid, and dihydrogenphosphate) at ionic strengths 0. moldm-3 (KCI, NaC1, and KNO3). The C-value, which is dependent on the ionic st rength and on the kind of the supporting electrolyte, is a function of the activity coefficient rpf, the hydrogen ion (yH) and of the liquid-junction potential between the salt bridge and the sample (Es). The values of log yH4-(δE/S), where S is the response slope of the glass electrode, calculated from the values of M. and C for hydrochloric acid, were consistent with those of our previous impel-0 regarding the liquid-junction potentials within ±0.01 pH unit. The C-value of weak acids is directly influenced by an uncertainty in the dissociation constant used. The calibration line proposed previously, pHm=ph + A, is an approximate relationship which can be derived from IiHm=-M. ph+C. A decrease in the pH-value of a strong acid accompanied by addition of a neutral salt can be explained by a decrease in the C-value with increasing ionic strength.
Journal
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- NIPPON KAGAKU KAISHI
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NIPPON KAGAKU KAISHI 1989 (12), 2028-2034, 1989-12-10
The Chemical Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204417658880
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- NII Article ID
- 130004060703
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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