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【多选题】
EDTA和金属离子形成的配合物有哪些特点?()A.
EDTA与金属离子配位时形成五个五元环，具有特殊的稳定性。
B.
EDTA与不同价态的金属离子生成配合物时，配位比简单，为1:1，易溶于水。
C.
EDTA与无色金属离子配位形成无色配合物，可用指示剂指示终点；EDTA与有色金属离子配位形成配合物的颜色加深，不利于观察。
D.
配位能力与溶液酸度、温度有其它配位剂的存在等有关，外界条件的变化也能影响配合物的稳定性。
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