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【简答题】
某溶液中含有Pb 2+ 和Ba 2+ ，①若它们的浓度均为0.10mol/L，问加入Na 2 SO 4 试剂，哪一种离子先沉淀?两者有无分离的可能?②若Pb 2+ 的浓度为0.00lOmol/L，Ba 2+ 的浓度仍为0.10mol/L，两者有无分离的可能?
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