Final answer:
The ionization constant, Kb, for HCO3 is 2.17 x 10-11.
Step-by-step explanation:
The ionization constant, Kb, for HCO3 (bicarbonate ion) can be calculated using the equilibrium equation for its ionization reaction. The equation is:
HCO3- + H2O <-> H2CO3 + OH-
The Kb value for HCO3 can be found in Appendix H, and it is 2.17 x 10-11.