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EC number: 200-929-3
CAS number: 76-05-1
Trifluoroacetic acid has a very low dissociation constant, indicating that the substance will exist primarily under its ionised form.
The publication of Strehlow 1990, despite good reliability assigned,
could not be used directly as the experimental work determined the
thermodynamical equilibrium (dissociation) constant, and not the (p)Ka,
and similarly for Kortum's handbook 1961 (citing Henne and Fox 1951).
Nevertheless, both references are cited in the publication of Bowden
1996, which discusses published work on TFA dissociation constant, and
are retained with a third value to adopt a mean pKa value of 0.47. For
the purpose of the present dossier, the Merck index (reference handbook)
value of pKa=0.3 will also be taken into account; the key value is
calculated as the mean of Bowden's value, with a weight coefficient of
3, and Merck's value: (0.47*3 + 0.3)/4.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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