You used 15.66 mL of NaOH (0.1007 M) to neutralize 10.00 mL of HA. Knowing that Ka (HA) = 2.0 x 10-5 and kb (A-) = 5.0 x 10 -10. Calculate the pH at the beginning of the titration, before adding any NaOH to one decimal place.
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