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CAS 81-90-3

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Phenolphthalin

Description:
Phenolphthalein is an organic compound commonly used as a pH indicator in titrations and other chemical analyses. It is a colorless crystalline solid at room temperature, but it exhibits a distinct color change when the pH of a solution shifts from acidic to basic. Specifically, phenolphthalein transitions from colorless in acidic conditions (pH below approximately 8.2) to pink in alkaline conditions (pH above approximately 10). This property makes it particularly useful in determining the endpoint of acid-base titrations. Chemically, phenolphthalein is a weak acid and can exist in different forms depending on the pH of the solution. It is soluble in alcohol and slightly soluble in water, which is important for its application in various laboratory settings. Additionally, phenolphthalein has been studied for its potential roles in biological systems and its historical use in medicine, although it is less commonly used today due to safety concerns. Overall, its distinctive color change and chemical properties make it a valuable tool in analytical chemistry.
Formula:C20H16O4
InChI:InChI=1S/C20H16O4/c21-15-9-5-13(6-10-15)19(14-7-11-16(22)12-8-14)17-3-1-2-4-18(17)20(23)24/h1-12,19,21-22H,(H,23,24)
InChI key:InChIKey=FFFPYJTVNSSLBQ-UHFFFAOYSA-N
SMILES:C(C1=C(C(O)=O)C=CC=C1)(C2=CC=C(O)C=C2)C3=CC=C(O)C=C3
Synonyms:
  • 2-[Bis(4-Hydroxyphenyl)Methyl]Benzoate
  • 2-[Bis(4-hydroxyphenyl)methyl]benzoic acid
  • 4′,4′′-Dihydroxytriphenylmethane-2-carboxylic acid
  • Benzoic acid, 2-[bis(4-hydroxyphenyl)methyl]-
  • Chocolax
  • Darmol
  • Evac-Q-Tabs
  • Ex-Lax
  • Modane Plus
  • Phenolphthalin
  • See more synonyms
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