下列实验能成功的是( ) ①用水鉴别CuSO 4 和Na 2 CO 3 固体;②用观察法区别Na 2 O和Na 2 O 2 ;③用MgCl 2 溶液鉴别Na 2 CO 3 溶液和NaOH溶液;④用稀盐酸鉴别Na 2 CO 3 溶液和NaCl溶液;⑤用BaCl 2 溶液鉴别Na 2 SO 4 溶液和AgNO 3 溶液.
A.
①②③
B.
②④⑤
C.
①②⑤
D.
①②④
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