Product Description:
Phenolphthalein is a chemical compound used as an acid-base indicator. It is colorless in acidic solutions and turns pink to purple as the solution becomes alkaline.
Applications & Uses:
CAS#:
77-09-8
SYNONYM:
3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone;Phenolphtalein;pH indicator
FORMULA:
C20H14O4
PRODUCT TYPE:
HAZARD:
Irritant
CATEGORIES:
Dyes and Colors
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Research and Development
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Raw Material
Phenolphthalein is a synthetic organic compound belonging to the phthalein dye family, renowned for its distinctive property as a pH indicator. Appearing as a white to yellowish-white crystalline powder, phenolphthalein is practically insoluble in water but dissolves readily in alcohol and other organic solvents. In alkaline solutions, it transforms into a vibrant pink to fuchsia hue, affording a visually striking and reliable means of determining endpoint transitions in titrations.
Beyond its primary use as a pH indicator, phenolphthalein serves as a key component in the formulation of disappearing inks and dyes. Additionally, it has historical significance in the medical field where it was used as a laxative, though its medicinal use has declined due to safety concerns. In experimental applications, phenolphthalein is occasionally utilized in forensic investigations to detect latent blood stains. Its versatility extends to its role in educational settings, where it provides a dynamic way to teach the principles of acid-base reactions and chemical equilibria. Phenolphthalein''s unique characteristics make it a valuable material in laboratories, classrooms, and specialized industrial applications.