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The pH of a salt of a weak acid and a weak base is given by:
ApH = 14 – pKa – pKb
BpH = 7 – pKa + pKb
CpH = 7 + ½(pKa – pKb)
DpH = ½(pKa + pKb) – 7
Answer & Solution
Correct answer: C. pH = 7 + ½(pKa – pKb)
Both ions hydrolyse, so the pH is set only by pKa and pKb, not by concentration.
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