【Daily Question】Chemical Analysis Version 2019.12.15
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This post was last edited by zjp on 2019-12-15 07:48. Multiple-choice question: What is the appropriate time to add starch indicator in the indirect iodometry method (i.e., iodine titration)? ( ) A. At the start of titration ； B. Titrate until near the endpoint, when the solution turns straw yellow. C. Titrate until the reddish-brown color of the I3- ions disappears and the solution becomes colorless ； D. When nearly 50% of the standard solution has been titrated ； B
B. Titrate to near the endpoint when the solution is straw yellow in color