Question

a substance is tested with litmus paper. the blue litmus paper remains blue while the red litmus paper remains red. what can you conclude about the substance? the substance is a base. the substance is neutral; it is neither an acid nor a base. the substance could be either an acid or a base. none of the above; it is impossible for both red and blue litmus paper to remain unchanged.

Explanation:

Litmus paper is an indicator. Blue litmus paper turns red in an acidic solution, and red litmus paper turns blue in a basic solution. Since both the blue and red litmus papers remain unchanged, the substance has a pH of around 7, which means it is neutral.

Answer:

The substance is neutral; it is neither an acid nor a base.