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N8257

α-Naphtholphthalein

>80% purity NaOH basis (titration), practical grade, powder

Synonym(s):

1-Naphtholphthalein; 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one

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About This Item

Empirical Formula (Hill Notation):
C28H18O4
CAS Number:
596-01-0
Molecular Weight:
418.44
NACRES:
NA.47
PubChem Substance ID:
24897859
UNSPSC Code:
12171500
EC Number:
209-875-5
MDL number:
MFCD00036202
Beilstein/REAXYS Number:
97816
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Product Name

α-Naphtholphthalein, practical grade

grade

practical grade

Quality Segment

assay

>80% NaOH basis (titration)

form

powder

technique(s)

titration: suitable

pH

7.3-8.7, colorless to blue-green

mp

238-240 °C (lit.)

solubility

ethanol: 50 mg/mL, clear, red-orange

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

Oc1ccc(c2ccccc12)C3(OC(=O)c4ccccc34)c5ccc(O)c6ccccc56

InChI

1S/C28H18O4/c29-25-15-13-23(17-7-1-3-9-19(17)25)28(22-12-6-5-11-21(22)27(31)32-28)24-14-16-26(30)20-10-4-2-8-18(20)24/h1-16,29-30H

InChI key

HQHBAGKIEAOSNM-UHFFFAOYSA-N

General description

α-Naphtholphthalein, a phthalein dye is a pH indicator between 7.3 (colorless) and 8.7 (greenish-blue). Applications include inks, markers, detecting viable cells, food storage, and many more.

Storage Class

11 - Combustible Solids

WGK

WGK 3

Flash Point (°F)

Not applicable

Flash Point (°C)

Not applicable

PPE (personal protective equipment)

dust mask type N95 (US), Eyeshields, Gloves

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