Phenol red is typically used as a pH indicator for neutral solutions. The solubility of this product is tested at 100 mg/mL in 1 N Sodium Hydroxide. The material has not been tested for solubility in acids. A 20 mM solution of Acetic acid is expected to have a pH of approximately 3.5. At a pH of 6.8 or less phenol red in solution is yellow. The visual transition interval of this indicator is 6.8 - 8.2, with anything higher than 8.2 being deep red in color.
P3532
Phenol Red
Bioreagent, Powder
Sinónimos:
Phenolsulfonphthalein
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About This Item
Fórmula empírica (notación de Hill):
C19H14O5S
Número de CAS:
Peso molecular:
354.38
Beilstein/REAXYS Number:
326470
EC Number:
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:
NACRES:
NA.47
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Nombre del producto
Phenol Red, powder, BioReagent, suitable for cell culture
product line
BioReagent
Quality Level
form
powder
technique(s)
cell culture | mammalian: suitable
color
dark red to dark brown
visual transition interval
6.8-8.2, yellow to red
mp
>300 °C
solubility
1 M NaOH: 1 mg/mL
application(s)
diagnostic assay manufacturing
storage temp.
room temp
SMILES string
Oc1ccc(cc1)C2(OS(=O)(=O)c3ccccc23)c4ccc(O)cc4
InChI
1S/C19H14O5S/c20-15-9-5-13(6-10-15)19(14-7-11-16(21)12-8-14)17-3-1-2-4-18(17)25(22,23)24-19/h1-12,20-21H
InChI key
BELBBZDIHDAJOR-UHFFFAOYSA-N
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General description
Phenol Red is a phenolsulfonphthalein compound. It is present as a sulfonated hydroxyquinone in weakly acidic aqueous solutions. In alkaline solutions, the dye forms a hydrophilic dianion (a small, red anion and has a larger conjugated system than the yellow hydroxyquinone).
Application
Phenol red is commonly used as a pH indicator in biology and medicine. It is incorporated into microbiological culture media for the identification of Escherichia coli strains. Its clinical diagnostic applications include investigation of gastric and duodenal ulcers and in the assessment of tear function in ophthalmology. Phenol red is also used as a tracer to assess the permeability of the ileal mucosal membrane and to assess bacterial leakage through root-filling materials in dentistry.
Suitable for use as a pH indicator.
signalword
Warning
hcodes
Hazard Classifications
Skin Irrit. 2 - STOT SE 3
target_organs
Respiratory system
Storage Class
11 - Combustible Solids
wgk_germany
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
dust mask type N95 (US), Eyeshields, Gloves
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I want to use phenol red power as an pH indicator, how much I need to add to 20mM acetic acid solution prepared by adding acetic acid to dH2O.
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