Explain the best acid to use in the preparation of a buffer

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Which is the best acid to use in the preparation of a buffer with pH = 9.3? can someone show me how to get the answer?

NH2OH (Kb = 9.1 x 10^-9)

CH3NH2 (Kb = 3.7 x 10^-4)

NH3 (Kb = 1.8 x 10^-5)

C6H5NH2 (Kb = 4.3 x 10^-10)

Reference no: EM13293304

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