Addition of strong acid or base to buffers When strong acid is added to a buffer solution containing HA and A-, the H+
consumes A- to form HA. So, [HA] increases while [A-] decreases.Two steps are required to calculate the resulting pH - first, a stoichiometry problem for the neutralization; second, an equilibrium problem for the new concentrationsHere, [HA] decreases while [A-] increases.