phenolphthalein


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Related to phenolphthalein: methyl orange

phe·nol·phthal·ein

 (fē′nōl-thăl′ēn′, -thăl′ē-ĭn, -thā′lēn′, -thā′lē-ĭn)
n.
A white or pale yellow crystalline powder, C20H14O4, used as an acid-base indicator, in making dyes, and formerly in medicine as an over-the-counter laxative.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

phenolphthalein

(ˌfiːnɒlˈθeɪliːn; -lɪɪn; -ˈθæl-)
n
(Chemistry) a colourless crystalline compound used in medicine as a laxative and in chemistry as an indicator. Formula: C20H14O4
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

phe•nol•phthal•ein

(ˌfi nɔlˈθæl in, -i ɪn, -ˈfθæl-, -nɒl-)

n.
a white, crystalline compound, C20H14O4, used as an indicator in acid-base titration and as a laxative.
[1870–75]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

phe·nol·phthal·ein

(fē′nōl-thăl′ēn′)
A white or pale-yellow, crystalline powder used as an indicator for acid and basic solutions. It is also used as a laxative and in making dyes.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.phenolphthalein - 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
laxative - a mild cathartic
acid-base indicator - an indicator that changes color on going from acidic to basic solutions
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Total alkalinity was determined by titration with sulfuric acid using methyl orange and phenolphthalein as indicators, also chloride by silver nitrate titrimetric method (Mhor M.).
Several antibiotics, barbiturates, oral contraceptives, nonsteroidal anti-inflammatory drugs, laxatives containing phenolphthalein, metronidazole, and quinine are known to be the primary drugs responsible for FDE (1,2).
Another 75 supplements contained phenolphthalein, a drug that was removed from the U.S.
Some weight-loss supplements also contained phenolphthalein (a laxative that the FDA took off the market in 1999 because it might cause cancer), Prozac (an antidepressant), or other drugs.
The colonies were sub cultured on selective media like mannitol salt agar which showed yellow coloured colonies indicating mannitol fermentation and phenolphthalein diphosphate agar where the colonies turned pink on exposure to ammonia.
in China, contains sibutramine, phenolphthalein and sildenafil, the FDA laboratory analysis found.
The dietary supplement "Hoodia Gordonii Gold Capsules" has been found to contain Sibutramine and Phenolphthalein which are prohibited in the UAE.
Some of the other agents causing urinary discoloration are Myoglobin, haemoglobin, porphyrins from endogenous sources whereas Rhubarb, black, berries, beet root, artificial food colors and medicines like Rifampin, desferoxamine, Phenolphthalein, Phen-azopyridine etc.
Then, titration was performed by 0.1N NaOH in the presence of phenolphthalein. As soon as red light was formed in the solution, titration was stopped.
The product in question, according to the health authority, were slimming capsules that contained sibutramine and phenolphthalein - two substances banned in the UAE due to their association with an increased risk of heart attacks and cancer.
In American method, blank analysis is necessary while the European method requires that solvent mixture (ethanol/ diethyl ether, 50/50 %(v/v)) has been neutralized, just before use, with KOH in presence of phenolphthalein solution.