Convert each of the Kb values to pKb = -log Kb and convert those to pKa by
pKa + pKb = 14
The closest pKa values to the desired pH is the one you want.
Which base listed below would be the best to creat a buffer having a pH of 5.0230?
hydrazine, Kb = 8.90e-7
methylamine, Kb = 3.70e-4
ethanolamine, Kb = 3.20e-5
pyridine, Kb = 1.40e-9
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