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Definition of Phenolphthalein
1. 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.
Definition of Phenolphthalein
1. n. 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 an indicator.
Definition of Phenolphthalein
1. Noun. (chemistry) A quinone derivative used as a pH indicator, and once used as a laxative ¹
¹ Source: wiktionary.com
Definition of Phenolphthalein
1. [n -S]
Medical Definition of Phenolphthalein
1. Obtained by the action of phenol on phthalic anhydride; used as a hydrogen ion indicator and as a laxative. (05 Mar 2000)
Lexicographical Neighbors of Phenolphthalein
Literary usage of Phenolphthalein
Below you will find example usage of this term as found in modern and/or classical literature:
1. Standard Methods for the Examination of Water and Sewage by American Chemical Society (1917)
"and partly because of defects in phenolphthalein as an indicator in such conditions.
... phenolphthalein indicator. Dissolve 5 grams of a good quality of ..."
2. A Manual of Pharmacology and Its Applications to Therapeutics and Toxicology by Torald Hermann Sollmann (1917)
"phenolphthalein Ibis is a mild tasteless purgative, acting probably on the large
intestine. ... phenolphthalein itself does not produce local irritation, ..."
3. The Chemical News and Journal of Industrial Science (1901)
"phenolphthalein. Methyl-orange. sodium carbonate solution was well diluted, ...
phenolphthalein. • Read before the Chemical Section ot the Franklin ..."
4. Diseases of the Digestive Organs: With Special Reference to Their Diagnosis by Charles Dettie Aaron (1921)
"phenolphthalein Ring Test for Occult Blood.— Boas prefers the phenolphthalein
test for occult hemorrhages of the gastro-intestinal canal. lie points out ..."
5. The Journal of Analytical and Applied Chemistry by Edward Hart (1893)
"The same results were obtained with phenolphthalein, even when the solution was
heated ... That the source of the difficulty lay with the phenolphthalein, ..."
6. The Nature of Solution by Harry Clary Jones, Ebenezer Emmet Reed (1917)
"The latter, from what has been said above, simply assumes that the weak, colorless
phenolphthalein molecules dissociate into hydrogen ions which combine ..."
7. A Textbook of Organic Chemistry by Joseph Scudder Chamberlain (1921)
"It was first prepared by Runge in 1834 being one of the very oldest dye compounds.
PHTHALEIN DYES phenolphthalein An important group of dyes known as the ..."
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