Methylrot (C.I. 13020) Indikator ACS,Reag. Ph Eur, 25 g

Specifications

• Identity (UV/VIS-Spectrum): passes test
• 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 %