1-NAPHTHOLPHTHALEIN Indicator grade

a-Naphtholphthalein

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Article No.
04770
Grade
Indicator grade
Purity
CAS No.
596-01-0
Molecular Formula
C28H18O4
Molecular Weight
418.45
H.S. Code
3204.9000
Shelf Life
60 Months
MSDS
 

 

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

Packings

  • 1CLVI00055

    1 g (00001)

  • 1GBA000015

    5 g (00005)

 

Specifications

Appearance Light Pink to Beige to Red-Brown Powder
Infrared spectrum Conforms
Absorption maxima (0.1N NaOH) 648 to 654 nm
Specific absorptivity 1%/1cm (at λmax) Min 550.0
Visual transition interval from pH 7.3 (pink-yellow) to pH 8.7 (green-blue)
Loss on drying (at 110°C; 1 hr) Max 5.0%

Safety Information and Hazard Symbols

Exclamation Mark
Symbol: GHS07
Signal Word: Warning
Hazardous Statement: H315-H319-H335
Precaution Statement: P261-P305 + P351 + P338
Revision Date : 06-Jul-2021
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