Home > Pallav Chemicals > pH Indicator (Solid) > 1-Naphtholbenzein (pH Indicator)

1-Naphtholbenzein (pH Indicator)
Used as an indicator 0.1g in 100 ml 2-propanol. a-Naphtholbenzein; 4,4'-(a-Hydroxybenzylidene)di-1-naphthol; p-naphtholbenzein

Product Code.
01781
Grade
Indicator grade
Purity
CAS No.
145-50-6
Molecular Formula
C27H18O2
Molecular Weight
374.44
H.S.Code
2914.50000
Shelf Life
60 Months

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

Packaging

Specification

Appearance
Dark red to red-brown to brown-black to orange-brown powder
Visual transition interval
Yellow to greenpH 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