Phenolphthalein

Build a molecular structure model of the pH indicator Phenolphthalein using Genuine Molymod Model Parts by Indigo

What is Phenolphthalein?

As an indicator, phenolphthalein's pH range is between 8.2-12 where it changes from colorless to pink/fucshia. In very acidic solutions near pH 0 phenolphthalein appears orange.

Phenolphthalein's uses include the Kastle-Meyer test for blood where the presence of hemoglobin causes the indicator solution to turn pink.

The phenolphthalein structure is a is good example of a C3 Point Group & shows "propeller" rotation. It was discovered in 1871 by German chemist Adolf von Baeyer & was commonly used as laxative until it was discovered to be a carcinogen.

A molecular model of Phenolphthalein in the Molymod Hybrid Dome style uses the atoms & bonds in the parts list below. Our free 3D Molecular Model Builder shows other styles & allows for image rotation as an assembly guide.

Chemical data
Molecular Weight Chemical Formula
318.3282 C20H14O4

Phenolphthalein molecular model built with Molymod Atoms & Bonds

Hybrid Dome
62053
Open Sphere
62009
Orbit Basic
68845NV
Orbit Flexible
68827W 68847W
Parts Synonyms
Parts
P/NDescriptionQTY
60150EAtom, Molymod, white (hydrogen), hemisphere, 19mm14
60200EAtom, Molymod, red (oxygen), 2 hole, 105 degrees4
60400EAtom, Molymod, black (carbon), 4 hole, 109.5 degrees, 23mm20
61012EBond, Molymod, grey (single), 20mm17
61013EBond, Molymod, grey (double/triple), 35mm20
61015EBond, Molymod, opaque, 2mm (for spacefilling models)14
Synonyms
  • 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one
  • 3,3-bis(4-hydroxyphenyl)isobenzofuran-1-one
  • 3,3-bis(4-hydroxyphenyl)-1-isobenzofuranone
  • 467-29-8
  • 57214-20-7
  • 77-09-8
  • C14286
  • NSC215214
  • component of Feen-A-Mint Pills
  • KBioSS_001557
  • P9750_SIAL
  • KBio2_001557
  • KBio2_004125
  • ZINC03831317
  • KBio2_006693
  • MLS000069592
  • NCGC00023694-06
  • Spectrum4_000982
  • NINDS_000929
  • 34605_RIEDEL
  • Evac-Q-Kit
  • 34606_RIEDEL
  • NCGC00023694-03
  • alpha-(p-Hydroxyphenyl)-alpha-(4-oxo-2,5-cyclohexadien-1-ylidene)-o-toluic acid
  • 34607_RIEDEL
  • SBB008868
  • DivK1c_000929
  • EU-0082600
  • BSPBio_002518
  • 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1(3H)-one
  • BCBcMAP01_000174
  • Spectrum2_001279
  • SPBio_001278
  • SPECTRUM1500480
  • KBio3_001776
  • SMR000059015
  • NCGC00023694-04
  • NCGC00023694-05
  • Spectrum3_000888
  • 1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxyphenyl)-
  • 3,3-Bis(4-hydroxyphenyl)phthalide
  • 3,3-Bis(p-hydroxyphenyl)phthalide
  • Chocolax
  • Espotabs
  • 3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone
  • 5-18-04-00188 (Beilstein Handbook Reference)
  • AI3-09081
  • Agoral
  • Alophen
  • BRN 0284423
  • CCRIS 6266
  • Colax
  • Correctol
  • Phthalide 3,3,-bis(p-hydroxyphenyl)-
  • Phthalimetten
  • Purga
  • Purgophen
  • Spulmako-lax
  • Trilax
  • WLN: T56 BVO DHJ D- D-/R DQ 2
  • component of Agoral
  • component of Correctol
  • Ex-Lax
  • Feen-A-Mint Laxative Mints
  • FemiLax
  • Fenolftalein [Czech]
  • Fenolftaleina [INN-Spanish]
  • HSDB 4161
  • Lax-Pills
  • Laxin
  • Medilax
  • NSC 10464
  • Phenolphtaleine [INN-French]
  • Phenolphthalein [USAN:BAN:INN]
  • Phenolphthaleinum [INN-Latin]
  • Phthalin
  • Purgen
  • Euchessina
  • alpha-Di(p-hydroxyphenyl)phthalide
  • InChI=1/C20H14O4/c21-15-9-5-13(6-10-15)20(14-7-11-16(22)12-8-14)18-4-2-1-3-17(18)19(23)24-20/h1-12,21-22
  • Feen-A-Mint Gum
  • ARONIS002962
  • Spectrum_001077
  • 319236_SIAL
  • Phenolphthalein solution
  • 37167_RIEDEL
  • Phenolphthalein Paper
  • Koprol
  • Laxogen
  • 105945_SIAL
  • Lilo
  • IDI1_000929
  • NSC10464
  • 33518_RIEDEL
  • Phenolax
  • Phenolphthalein
  • Dihydroxyphthalophenone
  • 16019_RIEDEL
  • KBio1_000929
  • Spectrum5_001268
  • EINECS 201-004-7
  • AIDS-018072
  • AIDS018072
  • D05456
  • Modane (TN)
  • Phenolphthalein (INN)
  • Evac-Q-Kwik
  • SMP1_000235
  • Evac-Q-Tabs
  • Evac-U-Gen
  • KBioGR_001383
  • NCI-C55798
  • Evac-V-Lax