Question

After finishing a lab, you have some chemicals left over. You do not want to waste

them, so you carefully pour them back into the container you got them from.

Answer 1

Instead, pour a small amount into a beaker or clean weigh dish. Once you have added a chemical to a container, label it promptly. When you are finished with the experiment, dispose of the excess chemical as chemical waste. Do not simply pour the excess chemical down the sink.