某温度时，可用K2S沉淀Cu2+、Mn2+、Zn2+三种离子(M2+ )，所需S2-最低浓度

某温度时，可用K2S沉淀Cu2+、Mn2+、Zn2+三种离子(M2+ )，所需S2-最低浓度的对数值lgc(S2-)与lg(M2+)的关系如图所示。下列说法正确的是

A.三种离子对应的硫化物中Ksp(CuS)最小，约为1×10-20

B.可用MnS除去MnCl2溶液中混有的少量杂质ZnCl2

C.向MnS的悬浊液中加入少量水，沉淀溶解平衡向溶解的方向移动，c(S2-)增大

D.向浓度均为1×10-5 mol·L-1的Cu2+、Zn2+、Mn2+混合溶液中逐滴加入l×l0-4 mol·L-1的Na2S溶液，Zn2+最先沉淀

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某温度时，可用K2S沉淀Cu2+、Mn2+、Zn2+三种离子(M2+ )，所需S2-最低浓度

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