Electrometric indicators in the amperometric titration of cations and acids.
Amperometric titration is carried out at zero potential in the presence of hydroquinone and p-aminophenol as electrometric indicators. Solutions of sodium carbonate, sodium arsenite, sodium tetraborate and potassium cyanide have been used as reagents in neutralisation, precipitation and complex formation reactions for the determination of cations separately, the simultaneous determination of several cations in one sample and of acid and cations present simultaneously. After the equivalence point has been reached, hydroxyl ions appear in the solution as a result of salt hydrolysis and a considerable increase in the current voltage occurs. The indicator in alkaline solution induces the depolarisation of the electrode.
Ruskul
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Department of Inorganic Chemistry, University of Lodz, Poland.