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319236

Sigma-Aldrich

Phenolphthalein solution

0.5 wt. % in ethanol: water (1:1)

Synonym(s):

C20H14O4; Phthalin;3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one

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About This Item

Empirical Formula (Hill Notation):
C20H14O4
CAS Number:
77-09-8
Molecular Weight:
318.32
Beilstein/REAXYS Number:
284423
MDL number:
MFCD00005913
UNSPSC Code:
12171500
PubChem Substance ID:
24859151
NACRES:
NA.47

form

liquid

Quality Level

200

concentration

0.5 wt. % in ethanol: water (1:1)

color

colorless

visual transition interval

8.0-10, colorless to red

mp

-35 °C

density

0.918 g/mL at 25 °C

λmax

552 nm

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

Oc1ccc(cc1)C2(OC(=O)c3ccccc23)c4ccc(O)cc4

InChI

1S/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/h1-12,21-22H

InChI key

KJFMBFZCATUALV-UHFFFAOYSA-N

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General description

Phenolphthalein is an acid base indicator. It is a weak acid, which is colorless in acidic solution and turns puce pink in alkaline solution. Phenolphthalein is genotoxic. It might cause oxidative damage and binds to estrogen receptors.
Phenolphthalein solution is a synthetic indicator. It is colorless in acidic and neutral conditions. Phenolphthalein gives pink color when added to a base, therefore it is considered as a base indicator.

Application

Phenolphthalein solution has been used to measure total titratable acids by titration method.

pictograms

FlameExclamation mark
GHS02,GHS07

signalword

Warning

Hazard Classifications

Eye Irrit. 2 - Flam. Liq. 3

Storage Class

3 - Flammable liquids

wgk_germany

WGK 3

flash_point_f

75.2 °F - closed cup

flash_point_c

24 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter

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