Amperometric titrations of weak acids with ethylenediamine and diethylamine in non-aqueous media.
The electrochemical cell : Cu |CuSO(4) + CH(3)OH parallelKNO(3) + CH(3)OH parallelsolution to be titrated Pt was used for the amperometric determination of weak and very weak acids separately and simultaneously present in non-aqueous solvents, with diethylamine and ethylenediamine as titrants. The amperometric measurements were carried out in the presence of pyrogallol as an electrometric indicator and without an externally applied potential. Solvent mixtures such as glycerol and methanol, propanol or isopropanol (1 + 1) have been used for the determination of weak acids such as benzoic, isobutyric and salicyclic. Mixtures of methanol, propanol or isopropanol with 1-3 ml of formamide were used for the determination of very weak acids such as a-naphthol and p-nittophenol.
Ruskul
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Department of Inorganic Chemistry University of Lódź, Poland.