Bestimmung der aciditätsfunktion Ho in konzentrierten wässrigen lödsungen der 1,3,5-trifluorbenzol-2,4-disulfonsäure

The acidity function H_o for 1,3,5-trifluorobenzene-2,4-disulfonic acid has been determined using the Hammett bases 4-nitro-, 2-nitro-, 4-chloro-2-nitro-, 2,5-dichloro-4-nitro- and 2,6-dichloro-4-nitroanilin in aqueous media. The experimental determination of the H_o value was possible up to 65 % 1,3,5-trifluorobenzene-2,4-disulfonic acid. Thereafter it was possible by extrapolation to ascertain the H_o values within the concentration range of 65 – 100 % 1,3,5-trifluorobenzene-2,4-disulfonic acid.