In an acid/base lab, a student used blue litmus paper and placed it in the sample. It stayed blue. Then the student used red litmus paper and it stayed red. What should the student's conclusion be?

Answer: The substance is neutral

Explanation:

If you place red litmus paper into a basic substance, it turn's blue. When it comes in contact with an acidic or neutral substance, it doesn't change colour it remains red.

Blue litmus paper in acid turns red when placed in a basic or neutral solution it remains blue. From this it can be concluded that the solution is neutral.