【Daily Question】Chemical Analysis Edition 2019.1.29
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This post was last edited by zjp on 2019-1-29 08:06. Multiple-choice question: Regarding the indirect iodometric method for determining reducing substances, which of the following statements are correct? （ ） A. The solution being titrated should be neutral or slightly acidic. B. There should be an appropriate excess of KI in the solution being titrated. C. The indicator is added near the endpoint; at the exact endpoint, the blue color of the solution being titrated disappears. D. The titration rate can be increased appropriately, and stirring of the solution being titrated should also be intensified simultaneously. E. The Cu2+ ions present in the solution being titrated have no effect on the determination. AB
B. The solution being titrated should contain an appropriate excess of KI. C. The indicator should be added near the end point, and at that moment the blue color of the solution being titrated disappears exactly. D. The titration rate can be increased appropriately, and the stirring of the solution being titrated should also be intensified simultaneously. E. The Cu2+ ions present in the solution being titrated have no impact on the determination