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【单选题】
在 BaSO 4 饱和溶液中,加入 Na 2 SO 4 固体粉末,达平衡时( )
A.
c ( Ba 2+ ) = c ( SO 4 2- )
B.
c ( Ba 2+ ) = c ( SO 4 2- ) = 1/2 [ ( BaSO 4 ) ]
C.
c ( Ba 2+ ) ¹ c ( SO 4 2- ) , [ c ( Ba 2+ ) / ] · [ c ( SO 4 2- ) / ] = ( BaSO 4 )
D.
c ( Ba 2+ ) ¹ c ( SO 4 2- ) , [ c ( Ba 2+ ) / ] · [ c ( SO 4 2- ) / ] ¹ ( BaSO 4 )
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