Phenolphthalein, known by its CAS number 77-09-8, is a fundamental chemical compound indispensable in analytical chemistry, primarily serving as a pH indicator. It presents as a white crystalline powder, characterized by its minimal solubility in water but significant solubility in alcohol. This solubility in alcohol is key for preparing it as a titrant indicator. The guaranteed phenolphthalein assay, typically within the 98.0%-101.0% range, ensures its suitability for accurate quantitative analysis.

The distinguishing feature of phenolphthalein is its clear color transition across a specific pH spectrum. It remains colorless in acidic and neutral solutions and turns a distinct pink or magenta color in alkaline conditions, usually when the pH surpasses 8.2. This sharp change makes it an ideal indicator for acid-base titrations, especially those involving strong bases and weak acids, or strong acids and strong bases. Understanding the detailed phenolphthalein chemical properties, including its phenolphthalein melting point of approximately 260℃, is vital for its effective laboratory application.

When procuring phenolphthalein, it is essential to identify reliable sources for phenolphthalein buy. Customers often seek suppliers who provide clear documentation on the phenolphthalein assay and other relevant specifications. The phenolphthalein solubility in alcohol is a practical aspect for laboratory preparations. Moreover, comparing the phenolphthalein price with product quality ensures that laboratories make informed purchasing decisions. The common uses of phenolphthalein extend to educational settings where it serves as a demonstrative tool for chemical principles.

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