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A titration of the weak base NH₃ is carried out using the strong acid HCl. Which of the following is true at the equivalence point?
A. pH = pKₐ
B. [NH₃] = [NH₄⁺]
C. [NH₃] = [HCl]
D. [H₃O⁺] = [OH⁻]
E. [NH₃] = ½[NH₄⁺]
F. None of the above