Journal of Thermal Analysis and Calorimetry

, Volume 51, Issue 2, pp 673–692 | Cite as

Catalytic Thermometric Titrations of Various Mixtures of Nitrogen Bases

  • B. F. Abramović
  • F. F. Gaál
  • S. D. Tepavčević
  • M. D. Lazarević
Thermometry, Enthalpimetry


The reactions of acetylation of hydroquinone and quinhydrone with acetic anhydride, catalysed by perchloric acid, were used to determine the end point of catalytic thermometric titrations of a number of different amines and amides dissolved either in acetic anhydride or in acetic acid-acetic anhydride (10+1) mixture. In the majority of cases primary and secondary amines could be successfully determined if pKbb≤9.3, tertiary amines if pKb≤14, and amides if pKb≤l5. Thanks to the difference in behaviour of organic bases in acety lation reaction, it was possible in some instances to determine selectively the individual bases in their mixtures. Catalytic titrations appeared to be especially suitable for the determination of extremely weak bases, even in the case of using mixtures of organic solvents, when Potentiometrie titrations could not be employed. Amounts of 2.5·10−6-8·10−5 mole of bases were determined with a maximal relative standard deviation less then 2%.


base mixtures determination of amides determination of amines determination of benzimidazole derivatives catalytic thermometric titration selective determination 


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Copyright information

© Akadémiai Kiadó 1998

Authors and Affiliations

  • B. F. Abramović
    • 1
  • F. F. Gaál
    • 1
  • S. D. Tepavčević
    • 1
  • M. D. Lazarević
    • 2
  1. 1.Institute of Chemistry, Faculty of SciencesUniversity of Novi SadNovi SadYugoslavia
  2. 2.Faculty of Technology and MetallurgySkopjeMacedonia

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