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a-Naphtholphthalein
1-naphtholphthalein

Product Code.
01782A
Grade
Purity
CAS No.
596-01-0
Molecular Formula
C28H18O4
Molecular Weight
418.45
H.S.Code
3204.90000
Shelf Life
60 Months

Physical Properties

Physical state at 20 °C
Solid
Colour
Black powder
Odour
Characteristic odour
Melting point/ Freezing point [°C]
238 - 240 °C
Vapour density
14.44
Solubility in water [% weight]
Insoluble in water
Partition coefficient Log Pow octanol / water at 20°C
5.41

Packaging

Specification

Appearance
Light Pink to Beige to Red-Brown Powder
Loss on drying (at 105°C)
Max 5%
pH transition range (7.1 - 8.3)
Brownish pink to blue
Absorption maxima (Buffer pH 7.1)
471 - 485 nm
Absorption maxima (buffer pH 8.3)
649 - 654 nm

Safety Information and Hazard Symbols

Symbol: GHS07
Signal Word: Warning
Hazardous Statement: H315-H319-H335
Precaution Statement: P261-P305 + P351 + P338