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Phenolphthalein Basic information
acid–base indicator Chemical Properties General Description Phenolphthalein molecular structure Phenolphthalein indicator Phenolphthalein test paper Pharmacology and Toxicology Pharmacokinetics Adverse reactions Application Production method
Product Name: Phenolphthalein
Synonyms: .alpha, alpha.-Di(p-hydroxyphenyl)phthalide;1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxyphenyl)-;1(3H)-Isobenzofuranone,3,3-bis(4-hydroxyphenyl)-;2,2-bis(p-hydroxyphenyl)phthalide;3,3-bis(4-hydroxyphenyl)-1(3h)-isobenzofuranon;alpha-(p-hydroxyphenyl)-alpha-(4-oxo-2,5-cyclohexadien-1-ylidine)-o-toluicacid;alpha-di-(p-hydroxyphenyl)phthalide;alpha-di(p-hydroxyphenyl)phthalide
CAS: 77-09-8
MF: C20H14O4
MW: 318.32
EINECS: 201-004-7
Product Categories: API;Chemistry;Analytical Chemistry;Indicator (pH);pH Indicators;Furan&Benzofuran;Phthalein;Indicator SolutionsStains and Dyes;P;Stains&Dyes, A to;Indicator Solutions;Indicators;Titration
Mol File: 77-09-8.mol
Phenolphthalein Structure
Phenolphthalein Chemical Properties
Melting point 258-263 °C
Boiling point 417.49°C (rough estimate)
density 1.299
refractive index 1.5400 (estimate)
Fp 24 °C
solubility Soluble in alcohol. Slightly soluble in ether. Slightly soluble in dimethyl sulfoxide and insoluble in benzene or hexane.
form Solid
Colour Index 764
pka 9.4(at 25℃)
color White to yellow-white
Odor Odorless
PH 7.8～10.0
PH Range 8.0(colorless)-10(Red)
Water Solubility <0.1 g/100 mL
λmax 552nm, 553nm, 374nm, 205nm, 229nm, 276nm
Merck 14,7243
BRN 284423
Stability: Stable. Incompatible with strong oxidizing agents, alkalies.
Major Application Display device, sensors, semiconductors, fuel cells, photoreceptors, electronic packaging, authentication system for secure documents, inks, correction fluid, paints, detection of defects in films, floor coatings, textiles, corrosion testing, explosive, concrete, toys, detecting lipase activity of crop seeds, soaps, method for prevention of drugmisuse, cosmetics, diapers, detecting viable cells, carbohydrates, antimalarial, treating amyloid-associated diseases
CAS DataBase Reference 77-09-8(CAS DataBase Reference)
IARC 2B (Vol. 76) 2000
NIST Chemistry Reference Phenolphthalein(77-09-8)
EPA Substance Registry System 3,3-Bis(4-hydroxyphenyl)phthalide (77-09-8)
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