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