Perchloric acid is very strong acid. So the conjugate base of perchloric acid is neutral ion. Hence KClO4 is neutral salt. Hydronium ion concentration = 1.0*10-7 M Solution Perchloric acid is very strong acid. So the conjugate base of perchloric acid is neutral ion. Hence KClO4 is neutral salt. Hydronium ion concentration = 1.0*10-7 M.