Ethanolic pH 4.5 Mixed Indicator is a ready-to-use solution composed of carefully blended pH indicators-Methyl Orange and Bromocresol Green-dissolved in 95% ethanol. This mixture is specifically designed to provide a sharp color transition around pH 4.5, making it ideal for analytical and titrimetric applications where precise pH detection is required.
🏭⚗️ Synthesis
The Ethanolic pH 4.5 Mixed Indicator is formulated by combining two pH-sensitive dyes-Methyl Orange and Bromocresol Green-in a controlled ratio and dissolving them in 95% ethanol. The production process ensures a stable, homogeneous solution that provides a clear and reliable color transition in the pH range of approximately 4.0 to 5.0.
✅ General Production Steps:
High-purity Methyl Orange and Bromocresol Green are selected for their complementary pH transition ranges. Each indicator is accurately weighed, typically 0.1 grams, and dissolved separately in 100 mL of 95% ethanol to prepare individual stock solutions. Equal volumes of these stock solutions are then mixed under gentle agitation to produce the final indicator blend. The resulting solution is optionally filtered for clarity and packaged in amber bottles to protect it from light degradation. Finally, the bottles are labeled with batch number, production date, and expiration date, and stored at room temperature in a dry, well-ventilated area.
🧪 Applications
• Visual pH estimation in laboratory settings
• Acid-base titrations near pH 4.5
• Educational experiments and chemistry demonstrations
• Quality control in food, pharmaceutical, and chemical industries
• Suitable for use in aqueous and alcohol-based systems
⚠️ Safety
• Highly flammable – Keep away from heat sources and open flames
• Store tightly closed in a cool, dry, and well-ventilated area, away from direct sunlight
• Use protective gloves and safety goggles while handling
• Avoid ingestion or contact with skin and eyes
• Keep out of reach of children
• Dispose of contents/container in accordance with local/regional regulations
