sentences:  The bond between positions 1 and 2 and the one between positions 2 and 3 have proved to have the same bond properties.Moreover, the proton does not tightly bind to any of the nitrogen atoms, but rather migrates rapidly between positions 1 and 3.Therefore, the BTA can lose a proton to act as a weak acid (pKa = 8.2) or accept a proton using the lone pair electrons located on its nitrogen atoms as a very weak Bronsted base (pKa < 0).