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In the titration of 20.0 mL of 0.200 M HOBr with 0.100 M NaOH, what is the pH after 20.0 mL of the NaOH solution is added? (Ka HOBr = 2.5 ×10^-9) A) 5.74 B) 4.65 C) 8.60 D) 7.00 E) none of these