AP Chemistry· difficulty 4/5
A weak acid HA (25.0 mL, 0.100 M) is titrated with 0.100 M NaOH. The midpoint of the curve occurs at pH 4.74.
What is pKa for HA?
5.00
7.00
9.26
4.74
Explanation
At the half-equivalence (midpoint), [HA] = [A⁻], so pH = pKa. Therefore pKa = 4.74.
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