[fee-nawl-thal-een, -ee-in, -fthal-, -nol-]
- a white, crystalline compound, C20H14O4, used as an indicator in acid-base titration and as a laxative.
Origin of phenolphthalein
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for phenolphthalein
Mix the saccharin with the tincture of vanilla, and incorporate the phenolphthalein.Candy Medication
Phenolphthalein as shown above is not a good indicator for this purpose.The Fundamentals of Bacteriology
Charles Bradfield Morrey
A solution of phenolphthalein loses its color when an acid is added to it.A Civic Biology
George William Hunter
If only perfectly fresh milk is used, the amount of acid will generally be about 0.15 per cent with phenolphthalein as indicator.Outlines of Dairy Bacteriology, 8th edition
H. L. Russell
When dark colored oils or fats are being titrated it is often difficult to obtain a good end point with phenolphthalein.Soap-Making Manual
E. G. Thomssen
- 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 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
(fē′nōl-thăl′ēn′, -thăl′ē-ĭn, -thā′lēn′, -thā′lē-ĭn)
- 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.
- 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: C20H14O4.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.