When you are done using most glassware in the lab, what is the appropriate action to take before returning it to its storage location?

• A. Leave any remaining chemicals in the glassware for the next user.
• B. Dispose of the glassware in the regular trash bin.
• C. Return the glassware immediately to the cabinet without cleaning.
• D. Rinse the glassware thoroughly with water and ensure it is clean and dry.

Answer: (D)

Verified step by step guidance

1. Understand that proper lab safety and hygiene require that glassware be cleaned before storage to avoid contamination and ensure safety for the next user.
2. Recognize that leaving chemicals in glassware can cause dangerous reactions or contamination, so it is not appropriate to leave any residue.
3. Know that disposing of glassware in the trash is wasteful and unsafe, as glassware is reusable and should be handled properly.
4. Identify that returning glassware without cleaning can lead to contamination and inaccurate results in future experiments.
5. Therefore, the correct procedure is to rinse the glassware thoroughly with water, clean it properly to remove all residues, and ensure it is dry before returning it to its storage location.