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【多选题】
下例关于金属指示剂选择条件,叙述正确的是( )A.
在滴定的pH范围内, 指示剂本身的颜色与它和金属离子生成配合物的颜色应相近；
B.
在滴定的pH范围内, 指示剂本身的颜色与它和金属离子生成配合物的颜色应有显著的差别;
C.
配位滴定时，一定要注意金属指示剂使用时对溶液pH值的要求；
D.
EDTA与金属离子形成的配合物的稳定性应比指示剂与金属离子形成的配合物稳定性大。
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