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You used 15.66 mL of NaOH (0.1007 M) to neutralize 10.00 mL of HA. Knowing that...

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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