An organic compound used as an acid-base indicator. The compound is colorless in acidic solution and pink in basic solution (with the transition occuring around pH 8.3). Phenolpthalein was used for many years as a laxative in very low concentrations- high concentrations are toxic!
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http://antoine.frostburg.edu/chem/senese/101/glossary/p.shtml
Phenolphthalein n is a chemical compound with the formula C20H14O4 and is often written as `HIn` or `phph` in shorthand notation. Often used in titrations, it turns colorless in acidic solutions and pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. In strongly basic solutions, phenolphthal...
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http://en.wikipedia.org/wiki/Phenolphthalein
• Alt. of Phenol phthalein
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http://thinkexist.com/dictionary/meaning/phenolphthalein/
an organic compound of the phthalein family that is widely employed as an acid-base indicator and as a laxative.[1 related articles]
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http://www.britannica.com/eb/a-z/p/55
Obtained by the action of phenol on phthalic anhydride; used as a hydrogen ion indicator and as a laxative. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
(fe″nol-thal´ēn) a cathartic and pH indicator.
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http://www.encyclo.co.uk/local/21001
Indicator dye that is colourless at neutral pH and red-pink in slightly alkaline solutions. Also used as a laxative.
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Phe`nol·phthal'e·in noun ,
or Phenol phthalein (Chemistry) A white or yellowish white crystalline substance, C
20 H
14 O
4 , formed by condensation of the anhydride of phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolo...
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http://www.encyclo.co.uk/webster/P/71
Type: Term Pronunciation: fē′nol-thal′ē-in, -thal′ēn Definitions: 1. A hydrogen ion indicator obtained by the action of phenol on phthalic anhydride; formerly used as a laxative.
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http://www.medilexicon.com/medicaldictionary.php?t=67888
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 in multiple species of experimental animals. The US government in 2000 classified phen...
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http://www.medterms.com/script/main/art.asp?articlekey=13444
Phenolphthalein is a derivative of triphenyl-methane, formed when phthalic acid is heated with phenol in the presence of a dehydrating agent. It is a pale yellow solid that is soluble in alcohol, and forms bright red compounds with alkalis, that are decomposed by the weaker acids - even carbon dioxide. On account of this it is used as an indicator ...
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http://www.probertencyclopaedia.com/browse/GP.HTM
[
n] - a laxative used in many preparations under various trade names
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http://www.webdictionary.co.uk/definition.php?query=phenolphthalein
noun a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8
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https://www.encyclo.co.uk/local/20974
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