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Which of the following weak acids when paired with its conjugate base would be the best choice for a buffer with a pH of 9.50

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Which of the following weak acids when paired with its conjugate base would be the best choice for a buffer with a pH of 9.50 ? HClO2:pKa=1.96 HClO:pKa=7.54 HNO2:pKa=3.34 C5H4NH+:pKa=5.25 HCN: pKa=9.31

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