What color does litmus paper turn in acidic solutions?

In acidic solutions, litmus paper turns red due to the presence of hydrogen ions (H⁺) which are characteristic of acids. Litmus paper is a pH indicator that changes color based on the acidity or alkalinity of a solution. When the pH of the solution is below 7, which indicates acidity, the blue litmus paper will turn red. This color change is a direct response to the increase in hydrogen ion concentration; as these ions interact with the dye in the litmus paper, they shift the color to red. This property makes it a useful tool for quickly determining whether a solution is acidic.