The precise measurement of pH is fundamental to countless scientific experiments and industrial processes. Among the array of indicators available, Congo Red stands out due to its distinct color transitions and specific pH range. This article will explore the critical Congo Red pH indicator properties and highlight its significance in various applications, emphasizing why it is a favored choice for many researchers and manufacturers.

Congo Red, a direct dye with the CAS number 573-58-0, exhibits a notable change in color within a specific pH range, making it an effective pH indicator. Typically, it appears blue or violet in acidic solutions up to a pH of approximately 3.0. As the pH increases and the solution becomes less acidic, it transitions through shades of red. The final color change to a distinct red occurs around pH 5.2. This distinct blue-to-red transition makes it particularly useful for titrations involving strong acids and bases, or for general pH estimations in this specific range.

The utility of Congo Red extends beyond its role as an indicator. As a dyestuff, it is widely used in textile dyeing and paper coloring. Its molecular structure, characterized by sulfonic acid groups, contributes to its water solubility and its affinity for cellulosic materials. Understanding the Congo Red chemical structure is key to appreciating its dyeing capabilities and its behavior as an indicator. When considering sourcing, looking for a reliable Congo Red dye supplier ensures the quality and consistency of these properties.

For professionals seeking to buy Congo Red powder, it's important to consider the grade and purity required for their specific application. For pH indication, a high-purity product is often preferred to ensure sharp and reliable color changes. The information regarding the Congo Red solubility in water is also vital; its good solubility allows for easy preparation of indicator solutions. When evaluating the Congo Red CAS 573-58-0 price, one should balance cost with the assurance of quality and performance.

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