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Lab Chemicals
pH Indicator (Solid)
1-NAPHTHOLPHTHALEIN
1-NAPHTHOLPHTHALEIN Indicator grade
a-Naphtholphthalein
Article No.
04770
Grade
Indicator grade
Purity
CAS No.
596-01-0
Molecular Formula
C
2
8
H
1
8
O
4
Molecular Weight
418.45
H.S. Code
3204.9000
Shelf Life
60 Months
MSDS
DE
EN
FR
KO
PT
ES
TH
TR
Certificate of Analysis (COAs)
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
1 g
(00001)
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
Symbol: GHS07
Signal Word: Warning
Hazardous Statement: H315-H319-H335
Precaution Statement: P261-P305 + P351 + P338
Revision Date :
06-Jul-2021