In the realm of chemical analysis and laboratory procedures, precise measurement and accurate observation are critical. Phenol Red (CAS: 143-74-8) is a cornerstone reagent, widely recognized for its utility as a pH indicator. Its well-defined color transition makes it an invaluable tool for various analytical applications, from simple pH checks to complex chemical titrations.

Phenol Red, chemically known as phenolsulfonphthalein, is a triphenylmethane dye. It is characterized by its solubility in water and ethanol, and a notable stability with a melting point exceeding 300°C. The primary utility of Phenol Red lies in its pH-dependent color change. In acidic solutions (below pH 6.8), it appears yellow. As the pH increases towards neutral and slightly alkaline conditions (around pH 7.4), it turns red. In more alkaline environments (above pH 8.2), it exhibits a bright pink or fuchsia color. This distinct chromatic shift allows for the visual determination of pH levels in various solutions.

This property makes Phenol Red indispensable in acid-base titrations. In a typical titration, where an acid is neutralized by a base (or vice versa), Phenol Red can effectively signal the endpoint of the reaction when the solution transitions from acidic to alkaline (or vice versa) at its specific pH range. Its use extends to water quality testing, where monitoring pH is crucial for environmental and safety compliance. Moreover, it finds application in buffer preparation and validation, ensuring the correct pH for various chemical and biological processes.

For researchers and industrial chemists, securing a consistent and high-quality supply of Phenol Red is paramount for reliable analytical outcomes. NINGBO INNO PHARMCHEM CO.,LTD., a leading manufacturer and supplier of chemicals in China, provides Phenol Red (CAS: 143-74-8) that meets stringent purity standards. We offer competitive pricing for this essential chemical, making it accessible for a wide range of laboratory and industrial needs. When you need to buy Phenol Red for accurate chemical analysis, trust our expertise and commitment to quality. Our efficient logistics ensure timely delivery, reinforcing our position as a dependable global supplier.