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为下列各滴定反应选择合适的指示剂：(1)AgNO 3 在pH=7.0条件下滴定Cl - (    )；(2)AgNO 3 在pH=2.0条件下滴定Cl - (    )；  (3)KSCN在酸性条件下滴定的Ag + 浓度(    )；(4)AgNO 3 滴定BaCl 2 溶液(    )；(5)AgNO 3 滴定FeCl 3 溶液(    )；(6)NaCl滴定AgNO 3 (pH=2.0)(    )。 A．K 2 CrO 4 B．荧光黄(pK a =7.0) C．二氯荧光黄(pK a =4.0)    D．曙红(pK a =2.0) E．(NH 4 ) 2 SO 4 ·Fe 2 (SO 4 ) 3
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