Concept:Litmus paper is an indicator that changes color to show whether a solution is acidic or basic.
Explanation:Blue litmus paper turns red only when it comes into contact with an acidic solution.
Acids are substances that release hydrogen ions (
H+) in water.
This color change is a standard test for acidity.
A basic solution would turn red litmus paper blue, not blue litmus paper red.
A neutral solution would not change the color of either blue or red litmus paper.
Therefore, the red color of the blue litmus paper confirms the solution is acidic.
Answer:C. The solution is acidic