Definitions for phenolphthalein
ˌfi nɔlˈθæl in, -i ɪn, -ˈfθæl-, -nɒl-phe·nolph·thalein

Princeton's WordNetRate this definition:0.0 / 0 votes

1. phenolphthaleinnoun

   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

WiktionaryRate this definition:0.0 / 0 votes

1. phenolphthaleinnoun

   A quinone derivative used as a pH indicator, and once used as a laxative

WikipediaRate this definition:0.0 / 0 votes

1. Phenolphthalein

   Phenolphthalein ( feh-NOL(F)-thə-leen) is a chemical compound with the formula C20H14O4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes. Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments. It is a weak acid, which can lose H+ ions in solution. The nonionized phenolphthalein molecule is colorless and the double deprotonated phenolphthalein ion is fuchsia. Further loss of proton in higher pH occurs slowly and leads to a colorless form. Phenolphthalein ion in concentrated sulfuric acid is orange red due to sulfonation.

ChatGPTRate this definition:0.0 / 0 votes

1. phenolphthalein

   Phenolphthalein is a chemical compound often used as a pH indicator in titrations. It’s a weak acid that changes color from colorless to pink as the solution changes from acidic to basic. It is made from phthalic anhydride and phenol in a condensation reaction. In its solid form, it appears as white or pale yellow crystals, but it's generally used in solutions mixed with alcohol and water. It has also been used over time as a laxative. However, it's not commonly used for that purpose today due to potential health risks.

WikidataRate this definition:0.0 / 0 votes

1. Phenolphthalein

   Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Often used in titrations, it turns colorless in acidic solutions and pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. In strongly basic solutions, phenolphthalein's pink color undergoes a rather slow fading reaction and becomes colorless again. The molecule has four forms: The rather slow fading reaction that produces the colorless InOH3− ion is sometimes used in classes for the study of reaction kinetics. Phenolphthalein is insoluble in water and is usually dissolved in alcohols for use in experiments. It is itself a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless. However, the phenolphthalein ion is pink. When a base is added to the phenolphthalein, the molecule ⇌ ions equilibrium shifts to the right, leading to more ionization as H+ ions are removed. This is predicted by Le Chatelier's principle.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Phenolphthalein

   An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.

Matched Categories

1. • Acid-base Indicator
   • Laxative

How to pronounce phenolphthalein?

1. Alex

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How to say phenolphthalein in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of phenolphthalein in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of phenolphthalein in Pythagorean Numerology is: 1

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=phenolphthalein
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Phenolphthalein
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Phenolphthalein
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=phenolphthalein