Bromocresol Green Sodium is widely used as a pH indicator in various analytical and laboratory applications. It is particularly effective in the pH range of 3.8 (yellow) to 5.4 (blue), passing through green at pH 4.5, making it useful for titration experiments in chemistry and biochemistry. In microbiology, it is employed in culture media to monitor pH changes during microbial growth. Additionally, it serves as a colorimetric reagent in environmental testing to assess water quality and acidity levels. Its ability to provide clear visual pH changes makes it a valuable tool in educational settings for teaching acid-base reactions. It is also used in the food and pharmaceutical industries for product quality control.