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Which of the following acids should be used to prepare a buffer with a pH of 5.5? A. C5H5O5COOH, Ka = 4.0 x 10–6 B. C6H4(COOH)2, Ka = 2.9 x 10–4 C. CH3COOH, Ka = 1.8 x 10–5 D. HBrO, Ka = 2.3 x 10–9 E. HOC6H4OCOOH, Ka = 1.0 x 10–3