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If a strong acid is mixed with a weak base, pH=pKa+/-1 in the buffer region.
Corrected:
If a strong base is mixed with a weak acid pOH= pKb +/-1 ( pH=(14 - pKb)+/-1) in the buffer region
[Remember: For one conjugated pair of weak acid (a = HB) AND its weak base (b = B-):
pKa + pKb = 14.0
and
pH + pOH = 14.0
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