Phenolphthalein, bearing the CAS number 77-09-8, is a ubiquitous chemical compound celebrated for its role as a pH indicator in analytical chemistry. Its physical form is a white crystalline powder, characterized by its practical insolubility in water but excellent solubility in alcohol. This solubility profile is key to preparing indicator solutions, and the typical phenolphthalein assay of 98.0%-101.0% underscores its suitability for precise scientific work.

The primary application of phenolphthalein is in acid-base titrations, where it signals the endpoint with a clear visual cue. It remains colorless in acidic solutions and turns a distinct pink or magenta when the solution becomes alkaline, typically at pH values ranging from 8.2 to 10.0. This sharp transition point is invaluable for accurately determining the concentration of acids or bases. Grasping the fundamental phenolphthalein chemical properties, such as its pH-dependent color change, is essential for chemists performing quantitative analysis. The compound's phenolphthalein melting point is around 260℃, indicating good thermal stability under normal laboratory conditions.

When sourcing phenolphthalein, customers often look for reliable phenolphthalein buy options that ensure consistent quality and adherence to specifications like the phenolphthalein assay. The phenolphthalein solubility in alcohol is also a practical consideration for solution preparation. For laboratories, understanding the competitive phenolphthalein price and the reputation of the supplier is crucial for efficient budgeting and reliable experimental outcomes. Beyond titrations, it serves as a valuable educational tool to illustrate chemical principles.

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