What is the Difference Between Bromocresol Blue and Bromocresol Purple?

Bromocresol blue and bromocresol purple are both pH indicators, but they have different color changes and applications. Here are the main differences between the two:

• Color Change: Bromocresol blue undergoes a color change from yellow (acidic color) to green (neutral) to blue (basic). In contrast, bromocresol purple has a transition from yellow at low pH values to purple at higher pH values.
• Appearance: Bromocresol blue is a greenish-violet powder with no odor. Bromocresol purple, on the other hand, is a purple-colored powder.
• pH Range: Bromocresol blue's color changes within a pH range of 3.8-5.4, making it more suitable for detecting the acidity or basicity of solutions. Bromocresol purple's color changes within a pH range of 5.2-6.8, making it more suitable for educational purposes and detecting a narrower range of pH values.
• Toxicity: Bromocresol purple is a non-flammable solid that emits acrid fumes when heated to decomposition and must be stored with proper ventilation. Bromocresol blue does not have these toxicity concerns.

In summary, bromocresol blue and bromocresol purple are both pH indicators, but they have different color changes, appearances, and pH ranges. Bromocresol blue is more suitable for detecting the acidity or basicity of solutions, while bromocresol purple is mainly used for educational purposes.

Comparative Table: Bromocresol Blue vs Bromocresol Purple

Bromocresol blue and bromocresol purple are both pH indicators, but they have some differences in their properties and color changes. Here is a table comparing the two:

Bromocresol blue is a greenish violet powder with no odor and has a pH range of 3.8–5.4, while bromocresol purple is a purple-colored powder with a pH range of 5.2–6.8. In solution, bromocresol blue changes color from yellow at low pH to blue at high pH, whereas bromocresol purple changes from yellow to purple.