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In the titration of 20.00 mL of 0.200 M HOBr with 0.100 NaOH, what is the volume of base, m mL, needed to reach the equivalence point? (Ka HOBr = 2.5 ×10^-9) A) 30.0 B) 40.0 C) 50.0 D) 20.0 E) 10.0