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【单选题】
铬黑T（EBT）是有机弱酸，其pK a2 =6.3，pK a3 =11.6，Mg 2+ -EBT的lgK 稳 =7.0。在pH=10时，lgK’（Mg-EBT）的值是（）A.
6.4
B.
5.4
C.
4.4
D.
7.0
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