Calculate the pH of a buffer solution that is 0.423 M in H3BO3 and 0.199 M in NaH2BO3. The Ka of H3BO3 is 5.8e-10. a) The pH of this solution is 8.9. b) The pH of this solution is 9.6. c) The pH of this solution is 0.7. d) The pH of this solution is 0.3. e) The pH of this solution is 9.2.