1.06076
Methyl red (C.I. 13020)
pH indicator, ACS, Reag. Ph Eur
Synonym(s):
Methyl red (C.I. 13020), 4-Dimethylaminoazobenzene-2′-carboxylic acid
About This Item
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Product Name
Methyl red (C.I. 13020), indicator ACS,Reag. Ph Eur
grade
ACS reagent
Quality Level
Agency
reag. Ph. Eur.
suitable for SM 4500 - NH3
form
powder
solid
loss
≤5% loss on drying, 110°C
color
red to red-violet
visual transition interval
4.4-6.0, red to yellow
mp
178-182 °C
bulk density
300‑500 kg/m3
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Analysis Note
Appearance: Red to red-violet powder, eventually with granular parts.
Clarity of solution (1 g/l; ethanol): passes test
Melting point (capillary method, temperatur measerment in the heating block): 179 - 182 °C
Transition range: pH 4.4 - pH 6.0 Red - yellow
Absorption maximum (buffer pH 4.5): 523 - 526 nm
Absorption maximum (buffer pH 6.2): 427 - 437 nm
Spec. Absorptivity A 1%/1cm (λmax; 0.005 g/l; buffer pH 4.5; calculated on anhydrous substance): 1350 - 1500
Spec. Absorptivity A 1%/1cm (λmax; 0.005 g/l; buffer pH 6.2; calculated on anhydrous substance): 700 - 800
Transition range (according to ACS): passes test
Loss on drying (110 °C): ≤ 5 %
Storage Class Code
11 - Combustible Solids
WGK
WGK 2
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Certificates of Analysis (COA)
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