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When the concentration of the weak acid is the same as the concentration of the conjugate base, the pH will be equal to the pKa of the weak acid. This is because from the Henderson Hasselbalch eq:pH = pKa + log [acid]/[conj.base] and when [acid] = [conj.base], the log of 1 = 0 and pH = pKa.

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Q: If 1.0L of this buffer contains an acid concentration of 0.50M and a conjugate base concentration of 0.50M what is the buffer pH?
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