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

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Chemistry

Which of the following bases should be used to prepare a bufferwith a pH of 4.5?

ammonia, Kb = 1.8 × 10-5

hydroxylamine, Kb = 1.1 × 10-8

codeine, Kb = 1.6 × 10-6

pyridine, Kb = 1.7 × 10-9

anyline, Kb = 3.8 × 10-10

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