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【单选题】
在没有配位副反应时,用 0.02mol/LEDTA 滴定同浓度的 Ca 2+ ,若溶液的 pH=8.0 时,化学计量点 pCa ¢ 为( ) 已知,lgKCaY=10.69,pH = 8.0时lgαY(H)=2.27
A.
5.2
B.
6.4
C.
7.0
D.
4.2
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