1.07233
Phenolphthalein
pH indicator, ACS, Reag. Ph Eur
Synonym(s):
Phenolphthalein
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About This Item
Product Name
Phenolphthalein, indicator ACS,Reag. Ph Eur
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
SMILES string
O1C(c4c(cccc4)C1=O)(c3ccc(cc3)O)c2ccc(cc2)O
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
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
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 %
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Danger
Hazard Classifications
Carc. 1B - Muta. 2 - Repr. 2 - Skin Irrit. 2
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
hcodes
Storage Class
6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
Certificates of Analysis (COA)
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