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Naphtholphthalein

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Naphtholphthalein
Skeletal formula
Ball-and-stick model
Names
Preferred IUPAC name 3,3-Bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1(3H)-one
Other names 1-Naphtholphthalein, alpha-naphtholphthalein, naphtholphthalein blue
Identifiers
CAS Number
3D model (JSmol)
Beilstein Reference 97816
ChemSpider
ECHA InfoCard 100.008.979 Edit this at Wikidata
PubChem CID
UNII
CompTox Dashboard (EPA)
SMILES
  • C1=CC=C2C(=C1)C(=CC=C2O)C3(C4=CC=CC=C4C(=O)O3)C5=CC=C(C6=CC=CC=C65)O
Properties
Chemical formula C28H18O4
Molar mass 418.448 g·mol
Appearance Colorless-reddish to blue-green solid
Melting point 238–240 °C (460–464 °F; 511–513 K)
Solubility in water Insoluble
Hazards
Occupational safety and health (OHS/OSH):
Main hazards Irritant
GHS labelling:
Pictograms GHS07: Exclamation mark
Signal word Warning
Hazard statements H315, H319, H335
Precautionary statements P261, P305+P351+P338
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

α-Naphtholphthalein (C28H18O4) is a phthalein dye used as a pH indicator with a visual transition from colorless/reddish to greenish blue at pH 7.3–8.7.

Naphtholphthalein (pH indicator)
below pH 7.3 above pH 8.7
7.3 ⇌ 8.7

References

  1. ^ α-Naphtholphthalein
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