16. In the acid-base titrations unit of Gr 12 chemistry, students learn the Henderich-Hasselbalch equation, PH = pka + log [A~] [HA] where HA and A are the relative concentrations of acids/bases. Determine the minimum pH of the acid and the time at which it occurs, in seconds. The pKa value, known as the dissociation constant, is measured to be 4.76 . [HA], the acid, can be expressed as a function after t minutes, HA(t) = 1 + 7t - 4t2 . [A ], the conjugate base, can be expressed as a function after t minutes, A(t) = 3t3 - t2 + 5