 Its p"K"a value in water cannot be accurately determined but in acetonitrile it has been estimated as −0.10 and in 1,2-dichloroethane −12.3 (relative to the p"K"a value of 2,4,6-trinitrophenol (picric acid), anchored to zero to crudely approximate the aqueous p"K"a scale), making it more acidic than triflic acid (p"K"aMeCN = 0.70, p"K"aDCE(rel.picric acid) = –11.4).Developing an IUPAC name for bistriflimide that indicates the structure and reactivity is challenging, and changes to current names have been proposed.