已知 K y (Ag 2 CrO 4 )=1.1×10 -12 , 在 0.10mol·L -1 Ag + 溶液中 , 若产生 Ag 2 CrO 4 沉淀 , CrO 4 2- 浓度应至少大于 :
A.
1.1×10 -11 mol·L -1
B.
6.5×10 -5 mol·L -1
C.
0.10mol·L -1
D.
1.1×10 -10 mol·L -1
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