Phenolphthalein, with the CAS number 77-09-8, is a vital organic compound widely recognized for its application as a pH indicator. It presents as a white crystalline powder, distinguished by its poor solubility in water but good solubility in alcohol. This characteristic is fundamental for its preparation into indicator solutions used in various analytical processes. The typical phenolphthalein assay ensures a high degree of purity, generally ranging from 98.0% to 101.0%, which is critical for accurate scientific measurements.

The primary function of phenolphthalein is its ability to indicate pH changes through a distinct color transformation. In acidic to neutral environments, it remains colorless. However, upon entering alkaline conditions, typically at pH values above 8.2, it exhibits a striking pink to magenta hue. This sharp visual transition makes it an indispensable tool for acid-base titrations, enabling chemists to precisely identify the equivalence point. Understanding the detailed phenolphthalein chemical properties, including its phenolphthalein melting point (approximately 260℃), is important for its proper handling and application in laboratory settings.

For professionals in the scientific field, sourcing reliable phenolphthalein is paramount. When looking for phenolphthalein buy options, it's advisable to consider suppliers who provide transparent documentation regarding the phenolphthalein assay and other critical specifications. The phenolphthalein solubility in alcohol is a key factor for those preparing custom indicator solutions. Moreover, evaluating the competitive phenolphthalein price against product quality ensures the best value for laboratory budgets. The common uses of phenolphthalein extend to educational demonstrations, where its color change vividly illustrates chemical reactions.

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