下列各组物质相互混合反应后，最终有白色沉淀生成的是（   ） ①金属钠投入到烧杯中的FeCl 2溶液中     ②过量NaOH溶液和明矾溶液混合 ③少量Ca(OH) 2投入过量NaHCO 3溶液中  ④向NaAlO 2溶液中滴入少量NaHSO 4溶液 ⑤向饱和Na 2CO 3溶液中通入足量CO 2 

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