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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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"Phenol phthalein" Quotes from Famous Books



... of a half normal potash solution, it is heated on a water bath for 3/4 hour. Then the uncombined excess of alkali is titrated with half normal hydrochloric acid. The alcohol must be tested as to its reaction before using it, and carefully neutralized with the acid of phenolphthalein. ...
— Scientific American Supplement, No. 443, June 28, 1884 • Various



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