Protolytic equilibria of picric acid in a mixture of protophobic and protophilic polar solvents non-donors of H-bonds |
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| Authors: | D O Ruzanov D V Samoilov K V Gensh Yu E Zevatskii N P Novoselov |
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| Institution: | 1.St. Petersburg State Institute of Technology (Technical University),St. Petersburg,Russia;2.JSC Novbythim,St. Petersburg,Russia;3.St. Petersburg State University of Technology and Design,St. Petersburg,Russia |
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| Abstract: | A new differentiating medium for the study of prototropic equilibria is proposed: acetonitrile with a small addition of DMSO.
From the dependence of the picric acid pK
a on the content of DMSO in this medium the optimum composition of the mixture was found ensuring the stability of the pK
a values with minimal addition of DSMO: 4 wt %. It was experimentally confirmed that the addition of water in an amount up
to 0.1 wt % has virtually no effect on the measured pK
a value in a mixture with the optimum composition. |
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