Selecting the appropriate pH indicator is a critical decision in many scientific endeavors, impacting the accuracy and reliability of experimental results. Among the diverse array of indicators available, Phenol Red (CAS: 143-74-8) stands out due to its distinctive properties and widespread utility. Understanding its behavior is key for chemists, biologists, and quality control professionals.

Phenol Red, also known as phenolsulfonphthalein, is a synthetic organic compound with the chemical formula C19H14O5S. It presents as a red crystalline solid, readily soluble in water and ethanol, which simplifies its preparation for use in aqueous solutions. Its most significant characteristic is its response to pH variations. The molecule undergoes structural changes that alter its absorption spectrum, leading to visible color changes. Specifically, Phenol Red transitions from yellow in acidic solutions (pH < 6.8) to red in neutral to slightly alkaline conditions (pH 6.8-8.2), and finally to a bright pink or fuchsia color in strongly alkaline solutions (pH > 8.2).

This predictable color change makes Phenol Red an excellent choice for a variety of applications. In educational laboratories, it's often used to demonstrate pH principles and acid-base titrations. In biological research, it's a common additive to cell culture media, providing a visual indicator of the culture's metabolic state. Its use extends to environmental monitoring, such as testing the pH of swimming pools, and in various industrial processes that require precise pH control. The clarity of its color transitions at specific pH points makes it a reliable indicator for these diverse needs.

For professionals seeking to buy Phenol Red, ensuring its quality is paramount. Impurities can affect the accuracy of the pH readings. NINGBO INNO PHARMCHEM CO.,LTD. is a leading manufacturer and supplier of high-purity Phenol Red (CAS: 143-74-8) from China. We pride ourselves on offering consistent product quality and competitive pricing, making us a trusted partner for laboratories and industries globally. By sourcing your Phenol Red from us, you can be confident in the reliability and performance of this essential chemical indicator.