alpha-Naphtholphthalein CAS 596-01-0

CAS: 596-01-0

Molecular Formula: C28H18O4

Molecular Weight: 418.44

EINECS: 209-875-5

Synonyms: 3,3-bis(4-hydroxynaphthalen-1-yl)-1,3-dihydro-2-benzofuran-1-one; alpha-Naphtholphthalein, indicator, pure 5GR; 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one; 1-NAPHTHOLPHTHALEIN INDICATOR PH 7,1 - 8; 1-NAPHTHOLPHTHALEIN; ALPHA-NAPHTHOLPHTHALEIN; NAPHTHOLPHTHALEIN

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What is alpha-Naphtholphthalein CAS 596-01-0?

The impurities in alpha Nathophthalein are mostly light red in color, which changes from light red to blue-green at pH 7.3-8.7.

Specification

Item	Specification
Boiling point	496.21°C (rough estimate)
Density	1.1532 (rough estimate)
Melting point	238-240 °C(lit.)
pKa	8.0, 8.2, 8.5(at 25℃)
resistivity	1.6400 (estimate)
Storage conditions	Store below +30°C.

Application

Alpha Nephthophyllein is used as an acid-base indicator. It is colorless to orange yellow at a pH of around 6.7 and changes from orange yellow to blue at a pH of around 7.9. Impurities in commercially available products often appear as a light red color, which changes from light red to blue-green at a pH of 7.3-8.7.