Variation ID | Product Code | Pack Size | List Price | Qty | |
---|---|---|---|---|---|
RRBD25700-U | 10g | £10.75 | |||
RRBD25700-W | 25g | £17.37 | |||
RRBD25700-X | 100g | £54.85 |
C.I. 13020 (Acid Red 2)
Methyl red (2-(N,N-Dimethyl-4-aminophenyl)azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1.
C.I. 13020
Molecular Formula: C15H15N3O2
Molecular Weight: 269.30
Melting Point: 179-182 deg C
Absorbtion Min (pH 4.5 Buffer): 523-526nm
Absorbtion Max (pH 4.5 Buffer): 427-437nm
Specific Absorbitvity (A1%/1cm): 1350-1450 (0.005g/L Buffer pH 4.5)
Specific Absorbitvity (A1%/1cm): 700-800 (0.005g/L Buffer pH 6.2)
Transition Range: pH 4.4-6.0 (Red-Yellow)
Loss on Drying (110degC): <5%
Cas Number: 493-52-7
Einecs Number: 207-776-1
HS Code / Commodity Code: 29270000