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【单选题】
称取结晶状态纯一元弱酸HA 0.4892g,溶于适量水中,以0.1000mol/lNaOH溶液滴定,滴定过程中得到如下数据:
A.
OH(ml) 0.00 21.42 42.84(化学计量点)
B.
2.65 4.70 8.43
C.
述数据可知,与该一元弱酸Ka最接近的数值为:
D.
4.0×10 -5
E.
2.0×10 -5
F.
1.0×10 -5
G.
1.5×10 -5
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