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Which combination is the best choice to prepare a buffer with a ph of 9.0?

Cynthia Baker

in Chemistry

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Ross Pratt on February 24, 2019

Among the given choices NH₃/NH₄Cl is the best choice for preparing a pH = 9.0 because the pKa of the salt of NH₄Cl almost equal to 9 (pKb = 4.75, so the pKa = 14 - pKb = 14 - 4.75 = 9.25). A tampon can not change your pH +/- pKa, and this combination is best to prepare the desired pH.


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