Microdetermination and pKa measurement of some aliphatic amines using the copper-ion-selective electrode |
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| Authors: | Saad S.M. Hassan Fayez Tadros Walter Selig |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt;2. Lawrence Livermore National Laboratory, University of California, Livermore, California 94550 U.S.A. |
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| Abstract: | Aliphatic amines were determined on the microscale by potentiometric titration with standard cupric sulfate solution in aqueous or partially aqueous (methanolic) medium. Electromotive forces were monitored with a copper-ion-selective electrode or a graphite rod impregnated with silver sulfide/cupric sulfide, and a double-junction reference electrode. Monoamines and diamines up to 1,3-diaminopropane reacted on a 2:1 amine:Cu basis. Diamines from 1,4-diaminobutane to at least 1,7-diaminoheptane reacted on an equimolar basis. The dissociation constants of some of the amines were determined. A linear relationship exists between the emf at half complexation and the dissociation constants of the amines tested. |
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