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7 December, 17:42

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

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  1. 7 December, 19:26
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    Among the given choices NH₃/NH₄Cl is the best choice to prepare pH = 9.0 because pKa of the salt of NH₄ Cl 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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