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EC number: 701-024-0
CAS number: 26038-87-9
Study technically not feasible (waiver)
The dissociation constant is a constant describing the equilibrium of
the dissociation of a compound in its different existing chemical forms
in solution. Dissociation constants are normally measured at different
dilutions. In the literature, the compiled values are those obtained
after extrapolation to infinite dilution. To be able to calculate the
dissociation constant, it is necessary to know the concentrations or
activities of all chemical forms participating in the equilibrium. In
the case of MEA Polyborate, the substance exists in a whole range of
rapidly interchanging chemical forms giving several overlapping non
resolved signals in NMR and IR spectroscopy. Any interference by
diluting or trying to measure the concentration of one of the entities
by chemical means will immediately shift the existing equilibrium.
Therefore it is impossible to obtain a reliable dissociation constant
for the MEA-Polyborate. Further, water is also part of the composition
of MEA-Polyborate, but it is impossible to discriminate between water
taking part in the reaction and water acting as solvent, again
precluding measuring the constant reliably. Conclusion: It is impossible
to obtain a reliable dissociation constant due to rapidly interchanging
forms and participation of water in the reaction equilibrium.
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