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【单选题】
现有50mL 0.1000mol/L某二元酸H2X,用0.1000 mol/L NaOH 滴定。在加入25mL NaOH时,pH = 4.80;加入50mL NaOH,即在第一化学计量点时pH = 7.15,则Ka2值为
A.
5.6×10-10
B.
3.2×10-10
C.
8.4×10-9
D.
7.1×10-8
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