Electrochemical determination of acidity level and dissociation of formic acid-water mixtures as solvent
The autoprotolysis constant KHS of formic acid/water mixtures as solvent has been calculated from acid-base potentiometric titration curves. A correlation of the acidity scale pKHS of each media vs. that of pure water has been implemented owing to the electrochemical redox function R°(H+) of Strehlo...
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | México |
| Recursos: | Centro de Innovación Aplicada en Tecnologías Competitivas |
| Repositorio: | Repositorio Institucional de CIATEC |
| Idioma: | inglés |
| OAI Identifier: | oai:ciatec.repositorioinstitucional.mx:1019/195 |
| Acesso em linha: | http://ciatec.repositorioinstitucional.mx/jspui/handle/1019/195 |
| Access Level: | acceso abierto |
| Palavra-chave: | info:eu-repo/classification/LEMD/Electroquímica info:eu-repo/classification/LEMD/Química física info:eu-repo/classification/cti/2 info:eu-repo/classification/cti/23 info:eu-repo/classification/cti/2307 info:eu-repo/classification/cti/221005 |
| Resumo: | The autoprotolysis constant KHS of formic acid/water mixtures as solvent has been calculated from acid-base potentiometric titration curves. A correlation of the acidity scale pKHS of each media vs. that of pure water has been implemented owing to the electrochemical redox function R°(H+) of Strehlow. The results show that formic acid/water mixtures are much more dissociated than pure water; they are sufficiently dissociated media to allow electrochemical measures without addition of an electrolyte. It has also been shown that for a same H+ concentration the activity of protons increases when formic acid concentration grows. For more than 80% by weight of formic acid the acidity is sufficiently increased so that the whole acidity scale pKHS is in the super acid medium of the generalized acidity scale pHH2O. |
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