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Specifications
| Grade | IND |
| pH Color Range | 6.0 (yellow) to 7.6 (blue) |
| Mass Absorption Coefficient | 52 L/cm·g min |
| Ethanol Dissolution Test | Qualified |
| Ignition Residue (in sulfate) | 0.3% max |
Applications
1. pH Indicator
Primary use is as a pH indicator in laboratory settings.
Color changes:
Yellow: pH < 6.0
Green: pH 6.0–7.6
Blue: pH > 7.6
Commonly used in:
Titrations
pH testing strips
Soil and water pH testing
Educational chemistry demonstrations
2. Biological and Medical Applications
Used in cell culture media (e.g., detecting acid production by microorganisms or cells).
Applied in respiration experiments (e.g., CO₂ detection), where carbon dioxide lowers pH, triggering a color change.
Helps track photosynthesis and respiration in experiments using aquatic plants.
3. Aquaculture and Aquarium Testing
Included in test kits to monitor the pH of aquarium water, ensuring the aquatic environment remains within safe limits for fish and plants.
4. Analytical Chemistry
Used in buffer solution formulations and complexometric titrations where precise pH indication is critical.
Supports monitoring of chemical reactions, especially those that involve acid/base changes.
5. Industrial Uses
Sometimes used in the textile industry for pH monitoring during dyeing or washing processes.
Incorporated into chemical sensors or smart packaging that detects spoilage through pH change (e.g., in food packaging applications).
Benefits
Clear and Distinct Color Change: Sharp transition between yellow and blue with a noticeable green intermediate near neutral pH.
Suitable for Neutral Range Detection: Ideal for experiments and processes where near-neutral pH shifts are most critical (e.g., biology and environmental science).
Non-toxic in Small Quantities: Generally safe for use in educational and biological settings.
Stable and Reusable: Has a long shelf life and remains stable when stored properly.
Versatile Solubility: Soluble in ethanol, making it easy to formulate into pH indicator solutions or sprays.
Conclusion
Bromothymol Blue (CAS 76-59-5) is a highly effective and widely used pH indicator, particularly valuable for detecting pH changes near neutrality. Its distinct and easily recognizable color shifts make it indispensable in chemical laboratories, biological experiments, educational settings, and environmental monitoring. Its versatility, clarity of transition, and general safety ensure its continued importance in both scientific research and industrial applications.
