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Calculate the pH after 10.0 mL of 0.400 M NaOH is added to 20.0 mL of 0.50 M CH3COOH. (Ka CH3COOH = 1.8 ×10^-5) A) 0.70 B) 2.52 C) 13.70 D) 7.00 E) 4.57