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

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02-04-2018
Chemistry

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

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ChemistryHelper2024 ChemistryHelper2024 · Answer 1 · 2018-04-11T18:13:02+02:00

ChemistryHelper2024 ChemistryHelper2024

11-04-2018

Among the given choices NH₃/NH₄Cl is the best choice to prepare pH = 9.0 because pKa of the salt of NH₄Cl nearly equals to 9 (pKb = 4.75, hence pKa = 14 - pKb = 14 - 4.75 = 9.25). A buffer can't change its pH +/- pKa, so this combination is best to prepare desired pH.

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