METHYL RED
METHYL RED
| Article No. | 533103 |
| Grade | AR |
| Purity | – |
| CAS No. | 493-52-7 |
| Molecular Formula | C₁₅H₁₅N₃O₂ |
| Molecular Weight | 269.31 |
| H.S. Code | 29270090 |
| Shelf Life | 60 Months |
Physical properties
| Physical State at 20 °C | Solid |
| Color | Dark red powder |
| Odor | Odorless |
| Melting Point/Freezing Point [°C] | 179°C |
| Vapor Density | 9.3 |
| Solubility in Water | Insoluble in water |
Specifications
| Appearance | Red, dark-red, maroon or violet powder |
| Solubility | Practically insoluble in water, soluble in ethanol (96%) |
| Melting Point | 178-182°C |
| Clarity of Alcohol Solution | Passes test |
| Loss on Drying | Max 5% |
| Absorption Maximum λ01 (pH 4.5) | 523-526 nm |
| Absorption Maximum λ02 (pH 6.2) | 427-437 nm |
| Absorptivity (1%/1cm) at λ01 max pH 4.5 | 1380-1480 |
| Absorptivity (1%/1cm) at λ02 max pH 6.2 | 700-800 |
| Visual Transition Interval | At pH 4.2 – pink, At pH 5.5 – orange, At pH 6.2 – yellow |
| Packings | 25 gm |
