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Phenolphthalein   /fˌinɑlfθˈeɪlən/  /fˌɛnɑlfθˈeɪlən/   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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"Phenolphthalein" Quotes from Famous Books



... powder shall be of a woolly texture, thoroughly delimed, preferably with hydrochloric acid. It shall not require more than 5 c.c. or less than 2.5 c.c. of decinormal NaOH or KOH to produce a permanent pink colour with phenolphthalein on 6.5 gm. of the dry powder suspended in water. If the acidity does not fall within these limits it must be corrected by soaking the powder before chroming for twenty minutes in ten to twelve times its weight of water, to which the requisite calculated quantity of standard alkali or acid has ...
— Synthetic Tannins • Georg Grasser


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