题目内容
（请给出正确答案）
A solution is 0.010mol·L-1in both Cu2+and Cd2+. What percentage of Cd2+remains in the solution when 99.9% of the Cu2+has been precipitated as CuS by adding sulfide？
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假定Mg(OH)2的饱和溶液完全解离，计算：
(1)Mg(OH)2在水中的溶解度；
(2)Mg(OH)2饱和溶液中OH-浓度；
(3)Mg(OH)2饱和溶液中Mg2+的浓度；
(4)Mg(OH)2在0.010mol·L-1NaOH溶液中的溶解度；
(5)Mg(OH)2在0.010mol·L-1MgCl2溶液中的溶解度。
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