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Phenol phthalein   Listen
noun
Phenol phthalein, Phenolphthalein  n.  (Chem.) A white or yellowish white crystalline substance, C20H14O4, formed by condensation of the anhydride of phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids. This reaction, being very delicate, is used as a pH indicator. It is sometimes used as a laxative in veterinary medicine.





Collaborative International Dictionary of English 0.48






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