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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?

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? Group of answer choices HClO: pKa = 7.54 C5H4NH+: pKa = 5.25 HNO2: pKa = 3.34 HCN: pKa = 9.31 HClO2: pKa = 1.96

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