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【单选题】
25 ℃下Ksp[Mg(OH)2]＝5.6110－12 ，Ksp(MgF2)＝7.4210－11 。下列说法正确的是A.
25 ℃时，饱和Mg(OH)2溶液与饱和MgF2溶液相比，前者的C(Mg2＋)大
B.
25 ℃时，在Mg(OH)2的悬浊液中加入少量的NH4Cl固体，C(Mg2＋)增大
C.
25 ℃时，Mg(OH)2固体在20 mL 0.01 molL－1氨水中的Ksp比在20 mL 0.01molL－1NH4Cl溶液中的Ksp小
D.
25 ℃时，在Mg(OH)2悬浊液中加入NaF溶液后，Mg(OH)2不可能转化为MgF2
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