question: In science class, a student obtains 20 mL of an acid solution. A small amount of acid is added to a substance to detect the presence of copper. What should be done with the excess acid solution?
choices.text: Pour the acid into a trash can. Neutralize the acid before pouring it down a sink. Return the acid to the teacher's stock bottle. Allow the water to evaporate from the acid solution.
choices.label: A B C D