Which of the following acids (listed with pK? values) and its conjugate would be the best choice to make a buffer with a pH of 5.20? Select one: a. HCN, pK? = 9.31 b. HF, pK? = 3.46 c. HClO?, pK? = 1.96 d. HClO, pK? = 7.54 e. HC?H?O?, pK? = 4.19
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