[Question of the Week] Participation from Oct 23 to Oct 29, 2017 grants +2 Wealth； Correct answers earn an additional +3~10 Wealth

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To increase the popularity of the chemical analysis section, a \"Question of the Week\" campaign has been launched to foster an active atmosphere for technical exchanges while providing rewards in the form of financial benefits to users. 【Weekly Question】Multiple-choice question: The appropriate time to add starch indicator in the indirect iodometry method (i.e., iodine titration) is ( ). 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 ； E. After 50% titration with the standard solution. Reply: B. Post your answer as a reply to participate in the quiz; you’ll receive +2 wealth points. If all your answers are correct, you’ll get an additional +3~8 wealth points. Those who provide thorough analysis and explanations regarding the questions or answers (or those with detailed calculation processes) will also be rewarded with extra wealth points. If your answer is correct and your analysis/explanations are accurate, it will be designated as the best reply (or the most helpful response). Feel free to answer the questions.