Phenolphthalein CAS 77-09-8 Phenolphthalein solution 3 3-Bi 4-hydroxyphenyl phthalide

Place of Origin: Shandong,China (Mainland)
Brand Name: MOSINTER
CAS No.: 77-09-8
Molecular formula: C20H14O4
Molecular weight: 318.32 g/mol
flash ( ing ) point: 299.7℃
Vapour pressure: 7.12E-13mmHg at 25℃
Boiling point: 548.7°C at 760 mmHg
Melting Point: 258-263℃
Flashing point: 299.7°C
Water solubility: <0.1 g/100 mL
Storage condition: Stable. Incompatible with strong oxidizing agents, alkalies.


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Product Description

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Payment Terms:T/T, WUProduction Capacity:500 Ton/Year
Min. Order:50 KilogramPacking:According to the...
Means of Transport:Ocean, Air, LandDelivery Date:within 7 days

Phenolphthalein (CAS: 77-09-8)





White   crystals

Melting point ℃


Boiling point

Past   test

Flash point

Past   test

Water solubility (g/100 ml) <


Physical property

phenolphthalein is a white small triclinic crystal and Stability in the air.Insoluble in water and Insoluble in benzene or hexane, very soluble in ethanol and ether, slightly soluble in DMSO.

Chemical property

Phenolphthalein in acidic solution is colorless and in alkaline solution is amaranth.

Below is showed in alkaline and acidic solutions


Phenolphthalein is a kind of weak organic acid.When the solution pH less than 8.2,it is a colorless lactone type structure.When the pH > 8.2 for red quinoid structure.Phenolphthalein color range from 8.2 to 10.0, so the phenolphthalein can only inspection alkaline not acid test.

Main application

1.The pharmaceutical industry pharmaceutical raw materials:Drug aperient,can stimulate the intestinal wall, and causing intestinal peristalsis promoting defecation.

2.Used in organic synthesis:Mainly used for synthesis of plastic,especially the synthesis of dinitrogen miscellaneous naphthalene poly (aryl ether ketone ketone polymer poly)aryl ether ketone.The polymers have excellent heat resistance,waterproof,corrosion resistance,ageing resistance and good formability.Made of fiber, coating and its composite materials is widely applied in many areas, such as electronic appliances, mechanical equipment, transportation, aerospace, nuclear engineering and military and other fields.

3.Used for alkali indicator:Nonaqueous solution titration indicator, chromatographic analysis reagent.

Storage transport

Sealed storage

Package:According to the customer request

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