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Supelco

Phenolphthalein

indicator ACS,Reag. Ph Eur

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Synonym(s):
Phenolphthalein
Empirical Formula (Hill Notation):
C20H14O4
CAS Number:
Molecular Weight:
318.32
MDL number:
UNSPSC Code:
12171502
EC Index Number:
201-004-7
NACRES:
NA.21

grade

ACS reagent

Quality Level

agency

reag. Ph. Eur.
suitable for SM 2310
suitable for SM 2320

vapor pressure

<0.00001 Pa ( 50 °C)

form

solid

loss

≤1% loss on drying, 105°C

color

white to yellow-white

visual transition interval

8.2-9.8, colorless to red-violet

mp

263.7 °C

density

1.296 g/cm3 at 20 °C

bulk density

350‑450 kg/m3

λmax

551-554 nm (buffer pH 9.8)

storage temp.

2-30°C

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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Related Categories

Application



  • Effectiveness of Phenolphthalein in Sol-Gel Coatings for Sensing and Inhibiting Corrosion on Mild Steel: Research detailing the application of phenolphthalein and Thymol Blue in sol-gel coatings, demonstrating their effectiveness in corrosion inhibition and sensing on mild steel surfaces (Patra et al., 2024).


  • Highly Permeable Ultrafiltration Membranes Based on Polyphenylene Sulfone with Cardo Fragments: This article discusses the development of advanced ultrafiltration membranes incorporating phenolphthalein, enhancing their permeability and filtration efficiency (Raeva et al., 2024).


  • A fluorescence-based dual sensor for Zn(2+) and PO(4)(3-): Study on a dual sensor system utilizing phenolphthalein, applied for the detection of zinc and phosphate ions in various environmental and biological samples, employing fluorescence signaling (Samanta et al., 2024).



Analysis Note

Identity (UV/VIS-Spectrum): passes test
Appearance: White to yellowish white powder
Clarity of the alkoholic solution (10 g/l ethanol): passes test
Absorption maximum λmax. (buffer pH 9.8): 551 - 554 nm
Spec. Absorptivity A 1%/1cm (λmax; 0.01 g/l; buffer pH 9.8; calculated on dried substance): 700 - 750
Transition range: pH 8.2 - pH 9.8 almost colorless - red-violet
Transition range (according to ACS): passes test
Transition interval (according Reag. Ph Eur): passes test
Loss on drying (105 °C): ≤ 1 %

pictograms

Exclamation markHealth hazard

signalword

Danger

Hazard Classifications

Carc. 1B - Muta. 2 - Repr. 2 - Skin Irrit. 2

Storage Class

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable


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