Cations of the homologous series of N-alkyl-N-ethylpyrrolidinium salts were determined with a good precision by a titration using sodium tetraphenylborate titrant and potentiometric indication with a simple PVC membrane coated-wire electrode. The value of the potentiometric titration break depended on the number of carbon atoms in the alkyl chain. To explain the role of the equilibria involved. the values of both the distribution ratios and the extraction constants as well as the solubility products of N-alky…
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