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Phenolphthalein   /fˌinɑlfθˈeɪlən/  /fˌɛnɑlfθˈeɪlən/   Listen
Phenolphthalein

noun
1.
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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"Phenolphthalein" Quotes from Famous Books



... powder shall be of a woolly texture, thoroughly delimed, preferably with hydrochloric acid. It shall not require more than 5 c.c. or less than 2.5 c.c. of decinormal NaOH or KOH to produce a permanent pink colour with phenolphthalein on 6.5 gm. of the dry powder suspended in water. If the acidity does not fall within these limits it must be corrected by soaking the powder before chroming for twenty minutes in ten to twelve times its weight of water, to which the requisite calculated quantity of standard alkali or acid has ...
— Synthetic Tannins • Georg Grasser


Words linked to "Phenolphthalein" :   acid-base indicator, laxative


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