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Lab Chemicals
pH Indicator (Solid)
1-NAPHTHOLBENZEIN
1-NAPHTHOLBENZEIN Indicator grade
Used as an indicator 0.1g in 100 ml 2-propanol.
a-Naphtholbenzein; 4,4'-(a-Hydroxybenzylidene)di-1-naphthol; p-naphtholbenzein
Article No.
04765
Grade
Indicator grade
Purity
CAS No.
145-50-6
Molecular Formula
C
2
7
H
1
8
O
2
Molecular Weight
374.44
H.S. Code
2914.5000
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
Dark reddish black
Odour
Odorless
Melting point/ Freezing point [°C]
185°C
Vapour density
12.9
Solubility in water [% weight]
Insoluble in water
Packings
5 g
(00005)
25 g
(00025)
Specifications
Appearance
Dark red to red-brown to brown-black to orange-brown powder
Visual transition interval
pH 8.2 (yellow to orange) to pH 10 (green-blue)
Absorption maxima in acetic perchloric acid 0.1 mol/L
622 - 626 nm
Safety Information and Hazard Symbols
Symbol: GHS07
Signal Word: Warning
Hazardous Statement: H315-H319-H335
Precaution Statement: P261-P305 + P351 + P338
Revision Date :
26-Oct-2020