Phenol Red, known chemically by its CAS number 143-74-8, is a compound whose specific chemical properties make it a valuable asset in various scientific and industrial applications. Understanding these properties is key for researchers and procurement managers seeking to buy Phenol Red. As a dedicated manufacturer from China, we provide detailed insights into the chemistry of Phenol Red and the purchasing options available to our clients.

At its core, Phenol Red is a triphenylmethane dye and a pH indicator. Its molecular formula is C19H14O5S, with a molecular weight of 354.38. The compound is typically supplied as a deep red crystalline powder. Its solubility characteristics are important for practical application; it dissolves readily in water, alcohol, and acetone, which facilitates its use in aqueous and alcoholic solutions commonly found in laboratories. However, it shows minimal solubility in non-polar solvents like ether and chloroform.

The defining chemical property of Phenol Red is its behavior as a pH indicator. It undergoes a distinct color transformation based on the acidity or alkalinity of the solution. In acidic conditions (below pH 6.8), it appears yellow. As the pH increases into the neutral and slightly alkaline range, it gradually transitions through orange and becomes red at pH 8.4 and above. This distinct pH-dependent color change is the basis for its use in acid-base titrations, where it signals the precise point of neutralization.

Beyond its indicator function, the chemical structure of Phenol Red contributes to its stability. It is stable in air, which is a significant advantage for storage and handling, ensuring its efficacy over time. This stability, coupled with its solubility, makes it a reliable choice for long-term laboratory use or for incorporation into diagnostic kits and culture media where consistent performance is vital.

When you are ready to purchase Phenol Red CAS 143-74-8, consider the options available from a reputable China manufacturer. We ensure that our product meets high standards for purity (≥98.0%) and particle size. We offer flexible packaging, such as 25kg bags or fiber drums, to accommodate different user needs. Our aim is to provide not just a chemical product, but a reliable solution backed by competitive pricing and efficient delivery services. Contact us for a quote or to learn more about the chemical properties and purchase details of our Phenol Red.