Skip to Content
Merck
All Photos(2)

Key Documents

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

Sign Into View Organizational & Contract Pricing


About This Item

Empirical Formula (Hill Notation):
C20H14O4
CAS Number:
Molecular Weight:
318.32
Beilstein:
284423
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:
NACRES:
NA.47

form

liquid

Quality Level

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

Looking for similar products? Visit Product Comparison Guide

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

Signal Word

Warning

Hazard Statements

Hazard Classifications

Eye Irrit. 2 - Flam. Liq. 3

Storage Class Code

3 - Flammable liquids

WGK

WGK 3

Flash Point(F)

75.2 °F - closed cup

Flash Point(C)

24 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number

Sorry, we don't have COAs for this product available online at this time.

If you need assistance, please contact Customer Support.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service