Coulometric generation of protons by oxidation of hydrogen dissolved in palladium, in non-aqueous media

Mihajlović, R.; Mihajlović, Lj. V.; Vajgand, Vilim J.; Jakšić, Lj.

doi:10.1016/0039-9140(89)80014-1

Cited by 14 publications

(2 citation statements)

References 15 publications

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“…In previously published papers, 5,6 it was shown that the use of a standard perchloric acid solution for titration of bases in aqueous and non-aqueous media can be avoided by generating perchloric acid coulometrically at a H 2 /Pd generator anode. Furthermore, a H 2 /Pd anode was applied as the source of hydrogen ions in the coulometric determination of the dissociation constant of bases in some aprotic solvents, as well as in the determination of autoprotolysis constants and relative acidity scales of some non-aqueous solvents.…”

Section: Introductionmentioning

confidence: 99%

Coulometric-potentiometric determination of autoprotolysis constant and relative acidity scale of water

Dzudovic¹,

Jaksic²

2010

JSCS

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The autoprotolysis constant and relative acidity scale of water were determined by applying the coulometric-potentiometric method and a hydrogen/palladium (H2/Pd) generator anode. In the described procedure for the evaluation of autoprotolysis constant, a strong base generated coulometrically at the platinum cathode in situ in the electrolytic cell, in presence of sodium perchlorate as the supporting electrolyte, is titrated with hydrogen ions obtained by the anodic oxidation of hydrogen dissolved in palladium electrode. The titration was carried out with a glass-SCE electrode pair at 25.0±0.1°C. The value obtained pKw = 13.91 ± 0.06 is in agreement with literature data. The range of acidity scale of water is determined from the difference between the halfneutralization potentials of electrogenerated perchloric acid and that of sodium hydroxide in a sodium perchlorate medium. The halfneutralization potentials were measured using both a glass-SCE and a (H2/Pd)ind-SCE electrode pairs. A wider range of relative acidity scale of water was obtained with the glass-SCE electrode pair

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Section: Introductionmentioning

confidence: 99%

Coulometric-potentiometric determination of autoprotolysis constant and relative acidity scale of water

Dzudovic¹,

Jaksic²

2010

JSCS

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“…Previously, the generation of hydrogen ions was performed quantitatively by the oxidation of hydroquinone and thus a new field of investigation, 1 with the application of some other compounds of low oxidation potentials, was opened. Some authors, [2][3][4][5] have applied a whole range of organic compounds, mercury and hydrogen dissolved in palladium as the medium for the generation of H + ions in the coulometric titrations of bases with visual, photometric and potentiometric end point determination. For the titration of bases in some aprotic solvents, instead of a standard solution of perchloric acid that is unstable in these solvents, Mihajlovic et al 6 used hydrogen ions generated by the electro-oxidation of some organic depolarizers at a platinum anode.…”

Section: Introductionmentioning

confidence: 99%

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

Simi¹,

Stani²,

Antonijevi³

2011

J. Braz. Chem. Soc.

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Os minerais naturais pirita e chalcopirita tem sido usados como sensores em eletrodos indicadores usando acetronitrila e propionitrila como solventes. Os resultados mostram vantagens excepcionais da pirita e chacopirita como sensores eletroquímicos e também a possibilidade de aplicação desses eletrodos para determinações em solventes não aquosos onde eletrodos de vidro mostram dificuldades. O comportamento dos eletrodos indicadores de pirita e chalcopirita em nitrila foi avaliado pela titulação de diversas bases e ácidos de forças diferentes usando prótons e íons liato gerados pela oxidação de alguns ésteres de ácido gálico e fenóis diidróxi, bem como m-cresol e 3-metóxifenol. Os resultados obtidos com esses eletrodos foram comparados com os de eletrodos de vidro nas mesmas condições, obtendo-se boa concordância, reprodutividade e precisão. Os desvios padrão na determinação dos ácidos e bases investigados foram menores do que 0,9%. Em titulações potenciométricas com pirita e chalcopirita como eletrodos indicadores, o potencial é instantaneamente estabelecido. Ambos os eletrodos podem ser usados sem qualquer limitação temporal ou divergências potenciais consideráveis.The natural minerals pyrite and chalcopyrite have been used as the indicator electrode sensors using acetonitrile and propionitrile as solvents. The results show the exceptional advantage of pyrite and chalcopyrite as electrochemical sensors and also the possibility of the application of these electrodes for the determination in nonaqueous solutions where glass electrode shows many defaults. The behaviour of the pyrite and chalcopyrite indicator electrodes in nitriles were checked by titrating several bases and acids of different strengths using protons and lyate ions generated by the oxidation of some gallic acid esters and dihydroxy phenols, as well as m-cresol and 3-metoxy phenol. The results obtained by using these electrodes were compared with those obtained by the application of a glass electrode under the same conditions, and good agreement, reproducibility and accuracy were obtained. The standard deviation of the determination of the investigated acids and bases was less than 0.9%. In the potentiometric titrations with pyrite and chalcopyrite indicator electrodes, the potential is instantaneously established throughout. Both electrodes can be used without any time limit or without considerable divergence in potentials.

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Coulometric generation of hydrogen ions by anodic oxidation of some organic compounds in nitromethane, sulpholane, acetonitrile and acetic acid—acetic anhydride

Mihajlović

Vajgand

Simić

1992

Analytica Chimica Acta

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Coulometric generation of protons by oxidation of hydrogen dissolved in palladium, in non-aqueous media

Cited by 14 publications

References 15 publications

Coulometric-potentiometric determination of autoprotolysis constant and relative acidity scale of water

Coulometric-potentiometric determination of autoprotolysis constant and relative acidity scale of water

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

Coulometric generation of hydrogen ions by anodic oxidation of some organic compounds in nitromethane, sulpholane, acetonitrile and acetic acid—acetic anhydride

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