phenolphthalein [fee-nawl- thal-een, -ee-in, - fthal-, -nol-] EXAMPLES | WORD ORIGIN noun . Chemistry, Pharmacology a white, crystalline compound, C 2 0H 1 4O 4, used as an indicator in acid-base titration and as a laxative.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for phenolphthalein Historical Examples of phenolphthalein
Mix the saccharin with the tincture of vanilla, and incorporate the
phenolphthalein. Phenolphthalein as shown above is not a good indicator for this purpose.
A solution of
phenolphthalein loses its color when an acid is added to it.
If only perfectly fresh milk is used, the amount of acid will generally be about 0.15 per cent with
phenolphthalein as indicator.
When dark colored oils or fats are being titrated it is often difficult to obtain a good end point with
phenolphthalein. British Dictionary definitions for phenolphthalein noun a colourless crystalline compound used in medicine as a laxative and in chemistry as an indicator. Formula: C 20 H 14 O 4
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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phenolphthalein in Medicine phenolphthalein [fē′nōl-thăl ′ēn′, -thăl ′ē-ĭn, -thā ′lēn′, -thā ′lē-ĭn] n. A white or pale yellow crystalline powder that is used as an acid-base indicator and a laxative.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
phenolphthalein in Science A white or pale-yellow, crystalline powder used as an indicator for acid and basic solutions. In solutions that are either neutral or basic, it is colorless, while it is pink or red in solutions that are alkali. It is also used as a laxative and in making dyes. Chemical formula: C 20H 14O 4.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.