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Which of the following bases should be used to prepare a buffer with a pH of...

Which of the following bases should be used to prepare a buffer with a pH of 6.0?

hydroxylamine, Kb = 1.1 × 10-8

ammonia, Kb = 1.8 × 10-5

pyridine, Kb = 1.7 × 10-9

anyline, Kb = 3.8 × 10-10

codeine, Kb = 1.6 × 10-6

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