105945

Phenolphthalein

ACS reagent

• 동의어(들): 3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone
• 실험식(Hill 표기법): C₂₀H₁₄O₄
• CAS Number: 77-09-8
• Molecular Weight: 318.32
• 색상 지수 번호: 764
• Beilstein: 284423
• EC Number: 201-004-7
• MDL number: MFCD00005913
• UNSPSC 코드: 12171500
• PubChem Substance ID: 24846716
• NACRES: NA.47

속성

• Grade: ACS reagent
• Quality Level: 200
• 양식: powder
• 기술: titration: suitable
• visual transition interval: 8.0-10, colorless to red
• mp: 261-263 °C (lit.)
• solubility: acetone: soluble
• density: 1.27 g/cm³ at 32 °C
• λmax: 374 nm (2nd); 552 nm
• 응용 분야: diagnostic assay manufacturing; hematology; histology
• 저장 온도: 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

설명

일반 설명

Phenolphthalein is an indicator for acid-base titration reactions. It changes from colorless to violet-red between pH 8.3-9.8, it is red in extremely acidic solutions, and colorless in extremely alkaline solutions.

It is present as a nonionic, lipophilic lactone in aqueous neutral solutions. It exists as a hydrophilic dianion in alkaline solutions.

애플리케이션

Phenolphthalein has been commonly used as an indicator in the fields of biology and medicine. Its applications include:

• the development of novel technique to monitor the vacuum freeze-drying process
• the determination of the depth of carbonation in concrete
• the utilization of liquid marbles to sense gaseous environmental components
• the estimation of total acidity in vinegar
• the assessment of sodium hydroxide penetration into potatoes following chemical peeling
• as a model organic compound in the evaluation of the capture efficiency of various cyclodextrin constructs such as nanofiber-CD

생화학적/생리학적 작용

Phenolphthalein is colorless in acidic solutions and turns pink in basic solutions.

원리

Phenolphthalein undergoes structural modification when there is a change in pH or in the structural state of water. It is a nonionic, lipophilic colorless lactone in aqueous neutral solutions and a hydrophilic dianion in alkaline solutions.

안전성 정보

• 픽토그램: GHS08,GHS07
• 신호어: Danger
• 유해 및 위험 성명서: H315,H341,H350,H361f
• 예방조치 성명서: P202 - P264 - P280 - P302 + P352 - P308 + P313 - P332 + P313
• Hazard Classifications: Carc. 1B - Muta. 2 - Repr. 2 - Skin Irrit. 2
• Storage Class Code: 6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
• WGK: WGK 3
• Flash Point (°F): Not applicable
• Flash Point (°C): Not applicable
• 개인 보호 장비: Eyeshields, Gloves, type P3 (EN 143) respirator cartridges