Dimethyl yellow is widely used as a pH indicator in various chemical and biological applications. It changes color from red to yellow within the pH range of 2.9 to 4.0, making it particularly effective in titration processes, where it helps to determine the endpoint of acid-base reactions. This property makes it valuable in laboratories for analytical chemistry experiments, including testing for substances like nitrates and nitrites in water. Additionally, it is employed in the textile industry for dyeing processes, where it acts as a colorant due to its vibrant yellow hue. In some cases, it is also used in educational settings to demonstrate pH changes and chemical reactions to students, providing a visual and practical understanding of chemical concepts.