【Daily Question】Chemical Analysis Version, 11.6.2019
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This post was last edited by zjp on 2019-11-6 08:35. Multiple-choice question: In direct complexometric titration, at the endpoint, the color of the solution is generally （）. A. The color of the complex formed between the metal ion under test and EDTA ； B. The color of the complex formed between the metal ion under test and the indicator ； C. Color of the free indicator ； D. The mixed color of the complex formed between metal ions and the indicator and the complex formed between metal ions and EDTA. C
C. Color of the free indicator；