319236

Phenolphthalein solution

0.5 wt. % in ethanol: water (1:1)

• Synonym(s): C₂0H₁₄O₄; Phthalin;3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one
• 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

Properties

• form: liquid
• Quality Level: 200
• concentration: 0.5 wt. % in ethanol: water (1:1)
• technique(s): titration: suitable
• 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

Description

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.

Safety Information

• pictograms: GHS02,GHS07
• signalword: Warning
• hcodes: H226,H319
• pcodes: P210 - P233 - P240 - P241 - P242 - P305 + P351 + P338
• 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