Phenolphthalein / phenol / phenol bran phthalein / phenol bran / fenotalin / Guodao

English name：Phenolphthalein；2-[Bis(4-hydroxyphenyl)methyl]benzoic acid；3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone; 3,3-Bis(4-hydroxyphenyl)phthalide

Other names: phenol;  Phenol bran; 3,3-bis (4-hydroxyphenyl) - 1 (3H) - isobenzofuranone; 3,3-bis (p-hydroxyphenyl) phthalide; Feynotalin; Fruit guide

CAS No.: 77-09-8

C20H14O4=318.33

Grade: ind

PH discoloration range: 8.0 (colorless) ～ 10.0 (red purple)

Loss on drying: ≤ 1.0%

Ethanol dissolution test: acceptable

Burning residue: ≤ 0.1%

Physicochemical properties: white or light yellow triclinic fine crystals, stable in air. 1g is dissolved in 12ml of ethanol and about 100ml of ether. It is dark red in dilute alkali solution, slightly soluble in chloroform and almost insoluble in water. The relative density is 1.299. The melting point is 258 ～ 262 ℃. Maximum absorption wavelength (in methanol) 205, 229, 276nm（ ε 27261.147、14692.144、2006.369)。 Minimum lethal dose (rat, abdominal cavity) 500mg / kg

Purpose: biochemical research. Acid base indicator; Non aqueous titration indicator; chromatographic analysis 

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