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Which of the following acids (listed with Ka values) and their conjugate base would be best to form a buffer with a pH of 2.34? A) HClO, Ka = 2.9 x 10^-8 B) HCN, Ka = 4.9 x 10^-10 C) HC7H5O2, Ka = 6.5 x 10^-5 D) HF, Ka = 3.5 x 10^-4 E) HClO2, Ka = 1.1 x 10^-2