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Which of the following is the correct way to dispose of excess reagent?

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Correct Answer: D. Dispose in the liquid waste containe.r
When dealing with excess reagent, you should never pour it back into the stock solution to avoid contamination. Unless told otherwise, it is best to only drain water in the sinks of a chemistry lab. If the reagent is toxic or flammable, leaving it in an open container is not a safe practice. Therefore, the proper way to dispose of excess chemicals is to put it in a clearly marked chemical waste container.
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