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