It’s asking to determine if its acidic or base. It’s acidic… But I guessed the answer….
C5H5NH+ F- –> C5H5N + HF
Keq = Ka (pyridineH+) / Ka (HF).
This compound is a salt, as it is the product of a reaction between an acid and a base. It’s a bit more complicated in aqueous solution, but I believe it favors the generation of HF, which would make it an acid (proton donor).
C5H5NHF –> C5H5NH+ + F-
the F- will grab an H+ from C5H5NH+ making the weak acid HF and C5H5N
Kb C5H5N = 1.7×10^-9 so, Ka C5H5N = 5.88×10^-6