在实验室中,使用移液管量取液体时,应先用待取液润洗移液管,再吸取液体。若量取过程中不慎将移液管尖端的气泡排出,正确的做法是:
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Correct answer
B. 重新润洗并吸取液体,确保无气泡
Principle or equation
移液管是精密量器,使用时必须保证管内无气泡,否则会导致量取体积不准确。正确操作是重新润洗并吸取液体,确保无气泡。
Why this answer is correct
移液管量取液体时,若尖端有气泡,实际量取的液体体积会偏小,影响实验结果的准确性。因此必须重新操作,排除气泡。
Example
例如,用移液管量取25.00 mL溶液时,若尖端有气泡,实际体积可能不足25.00 mL,导致浓度计算错误。
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