Bromocresol Green changes color from yellow to which color?

• A. Red
• B. Yellow
• C. Pink
• D. Blue

Answer: (D)

Bromocresol Green is a pH indicator. In acidic solutions it appears yellow, and as the solution becomes more basic, it shifts color to blue (with greenish hues around neutral). Its transition from yellow to blue happens over its pH range, roughly from about pH 3.8 to 5.4, so at higher pH the visible color is blue. The other colors listed don’t represent the final state of this indicator: red and pink aren’t typical end colors for Bromocresol Green, and yellow is the starting color in acidic conditions.