Final answer:
Bromocresol green is a chemical pH indicator that appears yellow below a pH of 3.8, green in the pH range of 3.8 to 5.4, and blue above pH 5.4, allowing for visual estimations of a solution's pH level.
Step-by-step explanation:
Bromocresol green is a pH indicator that changes color depending on the acidity or alkalinity of a solution.
Its color transition range is from pH 3.8 to 5.4. Below a pH of 3.8, bromocresol green appears in its acid form which is yellow in color.
Between pH 3.8 and 5.4, the indicator changes to intermediate shades of green, and above pH 5.4, it is in its base form which exhibits a blue color.
These color changes can be used in titrations or to estimate the pH of a solution visually.