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1-NAPHTHOLPHTHALEIN Indicator grade

a-Naphtholphthalein

COAs

Packings

1 g (00001)

5 g (00005)

1CLVI00055 1GBA000015
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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

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

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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