The Equation Shown Here Is the Net Reaction That Occurs $\rarr$

The equation shown here is the net reaction that occurs when a strong base is added to a CO₃^2-/HCO₃^- buffer solution (for carbonic acid, K_a1 = 4.2 * 10^-7, K_a2 = 2.4 * 10^-8): HCO₃^- + OH^- $\rarr$ CO₃^2- + H₂O