【Daily Question】February 6, 2017: +2 wealth for participation； +3 to +10 wealth for correct answers
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To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched to foster an active atmosphere for technical exchanges while offering members certain financial rewards. 【Daily Question】Multiple-choice question: During the measurement process, which of the following situations does not constitute an operational error? ( ) A. Weighing an item before it has cooled to room temperature. B. Rinsing the conical flask with the solution to be tested before titration. C. The weights used for weighing not being calibrated. D. Failing to rinse the pipette with the solution before using it to transfer the solution. Correct answer: C. Post your answer in the replies; participating in this question earns you +2 points. If you answer all questions correctly, you will receive an additional +3 to +8 points. Those who provide a thorough analysis and explanation of the questions or answers (or include detailed calculation processes) will receive extra points as a reward. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or best assistance). Feel free to answer the questions.
C. The weighing weights are not calibrated
This post was last edited by sxqssong on 2017-2-6 at 16:39. **: C A. Weighing an object before it has cooled to room temperature can cause thermal expansion of the balance components, leading to errors. B. Rinsing the conical flask with the solution to be tested before titration increases the amount of solution that will be used in the titration. D. Failing to wash the pipette with the solution before using it to transfer the solution can result in contamination of the transferred solution