Phenolphthalein, a compound identified by CAS number 77-09-8, is a widely used organic chemical, predominantly recognized for its function as a pH indicator. It appears as a white crystalline powder, largely insoluble in water but readily soluble in organic solvents like ethanol. This characteristic solubility profile makes it practical for preparing reagent solutions used in various chemical analyses. The typical phenolphthalein assay, usually between 98.0% and 101.0%, signifies the high purity required for its sensitive applications.

The core utility of phenolphthalein lies in its distinct color change across a specific pH range. It remains colorless in acidic and neutral solutions but develops a vibrant pink to magenta color in alkaline conditions, typically above pH 8.2. This predictable reaction makes it an essential tool for acid-base titrations, allowing chemists to accurately pinpoint the equivalence point of reactions. Understanding the nuanced phenolphthalein chemical properties, including its phenolphthalein melting point of approximately 260℃, is fundamental for its correct application in diverse laboratory settings.

For professionals in chemistry and related fields, securing high-quality phenolphthalein is crucial. When seeking phenolphthalein buy options, it is important to verify suppliers’ adherence to quality standards, such as the stated phenolphthalein assay. The phenolphthalein solubility in alcohol is also a practical consideration for preparing solutions. Evaluating the competitive phenolphthalein price in relation to product quality ensures that laboratories can acquire this vital reagent cost-effectively. The common uses of phenolphthalein include its widespread use in educational institutions for demonstrating chemical principles.

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