在溶液中有浓度均为0.01mol·L-1的Fe3+、Cr3+、Zn2+、Mf2+等离子,已知:

在溶液中有浓度均为0.01mol·L-1的Fe3+、Cr3+、Zn2+、Mf2+等离子,已知:

Ksp[Fe(OH)3]=2.6×10-39;Ksp[Cr(OH)3]=7.0×10-31

Ksp[Zn(OH)2]=1.0×10-17;Ksp[Mg(OH)2]=1.8×10-11

当氢氧化物开始沉淀时,下列哪一种离子所需溶液的pH最小

A.Fe3+                 B.Cr3+                 C.Zn2+                 D.Mg2+

 

答案

A

解析:略

 

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