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【单选题】
如果溶液中 Fe 3+ 和 Mg 2+ 离子的浓度都是 0.1 mol·L -1 ,溶液的 pH 在什么范围使 Fe 3+ 定量形成氢氧化物沉淀 , 而与 Mg 2+ 加以分离 ? 已知 Ksp[Fe(OH) 3 ] = 2.79×10 -39 , Ksp{Mg(OH) 2 } = 5.61×10 - 12 。A.
1.81 ～ 2.81
B.
8.00 ～ 9.01
C.
1.48 ～ 8.87
D.
以上都不对
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