Methyl Red indicator AR
C.I.No.13020
2-(N,N-Dimethyl-4-aminophenyl)azobenzenecarboxylic acid, C.I. Acid Red 2 ; acid base indicator
Product Code. |
01743 |
Grade |
AR |
Purity |
CAS No. |
493-52-7 | |
Molecular Formula |
C15H15N3O2 |
Molecular Weight |
269.31 |
H.S.Code |
2927.00900 |
Shelf Life |
60 Months |
Physical Properties
| Physical state at 20 °C |
Solid |
Colour |
Dark red powder |
Odour |
Odorless |
| Melting point/ Freezing point [°C] |
179°C |
Vapour density |
9.3 |
Solubility in water [% weight] |
Insoluble in water |
Packaging
Specification
| Appearance | Dark red to maroon to violet or purple powder or crystals |
| Identity | Passes test |
| pH transition range (4.4 - 6.2) | Pink Red - yellow orange |
| Insoluble matter in ethanol (1 g/L) | Passes test |
| Absorption maxima (buffer pH 4.5) | 523 - 526 nm |
| Absorption maxima (buffer pH 6.2) | 427 - 437 nm |
| Loss on dryig (at 110°C) | Max 5.0% |
| Residue on ignition (as SO4) | Max 2.0% |
Safety Information and Hazard Symbols