Consider the Reaction CO₃^2-(aq) + H₂O(l) $\rightleftharpoons$ HCO₃^-(aq) + OH^-(aq)

Multiple Choice

Consider the reaction CO₃^2-(aq) + H₂O(l) $\rightleftharpoons$ HCO₃^-(aq) + OH^-(aq) . K_b for CO₃^2- is 2.1 × 10^-4 at 25°C. What is K_a for the HCO₃^- ion at 25°C?

A) 4.8 × 10³
B) 4.8 × 10^-11
C) 2.1 × 10^-4
D) 7.2 × 10^-12
E) 9.2 × 10^-8