phenolphthalein

phenolphthalein
/fee'nawl thal"een, -ee in, -fthal"-, -nol-/, n. Chem., Pharm.
a white, crystalline compound, C20H14O4, used as an indicator in acid-base titration and as a laxative.
[1870-75; PHENOL + PHTHALEIN]

* * *

      an organic compound of the phthalein family that is widely employed as an acid-base indicator and as a laxative.

      Phenolphthalein is a potent laxative, which acts within 6–8 hours; its effects may last 3–4 days. Such adverse reactions as kidney irritation or skin rash may occur. As an indicator of the pH of a solution, phenolphthalein is colourless below pH 8.0 and attains a deep red hue above pH 10.0.

      Phenolphthalein, which is closely related to the triphenylmethane dyes, was discovered in 1871 by the German chemist Adolf von Baeyer (Baeyer, Adolf von), who prepared it by fusing phenol and phthalic anhydride in the presence of sulfuric acid or zinc chloride, the procedure still employed.

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Phenolphthalein — IUPAC name 3,3 bis(4 hydroxyphenyl)isobenzofuran 1(3H) one …   Wikipedia

  • Phenolphthalein — Phe nol*phthal e*in, n., or Phenol phthalein Phenol phthalein(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 …   The Collaborative International Dictionary of English

  • Phenolphthalein — Phenōlphthaleīn, s. Phthalsäure …   Kleines Konversations-Lexikon

  • phenolphthalein — [fē΄nōl thal′ēn΄, fē΄nōl thal′ē in; fē΄nōl fthal′ēn, fē΄nōlfthal′ē in] n. [ PHENOL + PHTHALEIN] a white to pale yellow, crystalline powder, C20H14O4, used as a laxative, in making dyes, and as an acid base indicator in chemical analysis: it is… …   English World dictionary

  • Phenolphthalein — Strukturformel Allgemeines Name Phenolphthalein Andere Namen …   Deutsch Wikipedia

  • Phenolphthalein — A compound used as a laboratory reagent and acid base indicator and also used in over the counter (OTC) laxative preparations. Phenolphthalein may be a carcinogen (cancer causing agent). Feeding of phenolphthalein caused cancer in multiple organs …   Medical dictionary

  • Phenolphthalein — Phe|nol|phtha|le|in auch: Phe|nolph|tha|le|in 〈n. 11; unz.; Chem.〉 zur Gruppe der Phthaleine zählender Triphenylmethanfarbstoff, wird als Indikator in der analytischen Chemie verwendet * * * Phe|nol|phtha|le|in [↑ Phthalein] Syn.: 3,3 Bis(4… …   Universal-Lexikon

  • phenolphthalein — fenolftaleinas statusas T sritis chemija apibrėžtis Indikatorius. formulė C₆H₄:[C(HOC₆H₄)₂OC(=O)] atitikmenys: angl. phenolphthalein rus. фенолфталеин ryšiai: sinonimas – 3,3 bis(4 hidroksifenil) 3H 1 izobenzfuranonas …   Chemijos terminų aiškinamasis žodynas

  • phenolphthalein test — (for blood) boil a thin fecal suspension, cool, and add it to half as much reagent (made by dissolving 1 to 2 g of phenolphthalein and 25 g of potassium hydroxide in water). Add 10 g of metallic zinc and heat until decolorized. A pink color… …   Medical dictionary

  • phenolphthalein — noun Etymology: International Scientific Vocabulary phenol + phthalein any of various xanthene dyes, from phthalic acid Date: 1875 a white or yellowish white crystalline compound C20H14O4 used in analysis as an indicator because its solution is… …   New Collegiate Dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”