If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
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 Segment
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 %
1 of 1
This Item | |||
|---|---|---|---|
| vapor pressure <0.00001 Pa ( 50 °C) | vapor pressure - | vapor pressure - | vapor pressure - |
| loss ≤1% loss on drying, 105°C | loss - | loss - | loss - |
| bulk density 350‑450 kg/m3 | bulk density - | bulk density - | bulk density - |
| form solid | form powder | form liquid | form - |
| color white to yellow-white | color - | color colorless | color - |
| agency reag. Ph. Eur., suitable for SM 2320, suitable for SM 2310 | agency - | agency - | agency - |
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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)
Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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