题目内容

pH 值为9.40的一元弱碱溶液中OH- 离子浓度为 ( )。

A. 4.0×10-10 mol·L-1
B. 2.5×10-9 mol·L-1
C. 4.0×10-6 mol·L-1
D. 2.5×10-5 mol·L-1

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