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Phenolphtalein, ACS

Phenolphtalein, ACS

Synonyms 3,3-bis[4-Hydroxyphenyl]-1-[3H]- isobenzofuranone; 3,3-bis(p-Hydroxyphenyl) phthalide; a-(p-Hydroxyphenyl)-a-(4-oxo-2,5-cyclohexadien-1-ylidine)-o-toluic acid

CAS Number: 77-09-8 Molecular Formula: C20H14O4 Molecular Weight: 318.328 g/mol

Beilstein Registry Number: 284423 EC Number: 201-004-7 MDL Number: MFCD00005913

SKU 02102608-CF
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Description

Product Description

Phenolphtalein, ACS

Application Notes

Phenolphthalein Can be used in a 1% alcoholic solution as an indicator in titrations of mineral and organic acids and most alkalies. Not suitable for ammonia. Very sensitive to CO2; and, in estimating carbonates, the liquid must be boiled. Borax can be titrated with phenolphthalein as an indicator only when glycerol is present, because the color gradually fades away as the acid is added. Usable with a few alkaloids.

Usage Statement

Unless specified otherwise, MP Biomedical's products are for research or further manufacturing use only, not for direct human use. For more information, please contact our customer service department.

Key Applications

Indicator in titrations of mineral and organic acids and most alkalies

Specifications
SKU 02102608-CF
Alternate Names 3,3-bis[4-Hydroxyphenyl]-1-[3H]- isobenzofuranone; 3,3-bis(p-Hydroxyphenyl) phthalide; a-(p-Hydroxyphenyl)-a-(4-oxo-2,5-cyclohexadien-1-ylidine)-o-toluic acid
Application Notes Phenolphthalein Can be used in a 1% alcoholic solution as an indicator in titrations of mineral and organic acids and most alkalies. Not suitable for ammonia. Very sensitive to CO2; and, in estimating carbonates, the liquid must be boiled. Borax can be titrated with phenolphthalein as an indicator only when glycerol is present, because the color gradually fades away as the acid is added. Usable with a few alkaloids.
Base Catalog Number 102608
Beilstein Registry Number 284423
CAS # 77-09-8
Color Index 764
Density 1.299 at 77° F (NTP, 1992)
EC Number 201-004-7
Format Powder
Grade ACS grade
Hazard Statements H341-H350-H361
Melting Point 496 to 504° F (NTP, 1992)
Molecular Formula C20H14O4
Molecular Weight 318.328 g/mol
Personal Protective Equipment Eyeshields, full-face particle respirator, Gloves, respirator filter, respirator cartridges
pKa 9.7 at 25 °C(Lit.)
RTECS Number SM8380000
Safety Symbol GHS08
Solubility less than 1 mg/mL at 66° F (NTP, 1992)
Usage Statement Unless specified otherwise, MP Biomedical's products are for research or further manufacturing use only, not for direct human use. For more information, please contact our customer service department.
UV Visible Absorbance λmax 552 nmλmax 374 nm (2nd)
Vapor Pressure 6.7X10-13 mm Hg @ 25 deg C /Estimated/